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What Is Malicious Activity? Understanding Bot Traffic & Invalid Traffic

Anura PR Team June 11, 2026

Bots IVT

What Is Malicious Activity? Understanding Bot Traffic & Invalid Traffic

TL;DR:

Malicious activity is any online action intended to deceive, manipulate, exploit, or harm a business, user, or digital property.
Both humans and bots carry out malicious actions.
Invalid traffic (IVT) is non-human traffic that cannot become a customer or generate revenue.
Malicious bot activity wastes ad spend, creates fake leads, and corrupts analytics.
Most businesses first encounter malicious activity as a number in their dashboard they cannot explain, not an attack
AI-powered bots are making malicious activities harder to detect through traditional methods

What Is Malicious Activity?

Malicious activity refers to any online action designed to cause harm, commit fraud, manipulate systems, or disrupt legitimate business operations. These malicious actions can be carried out by humans or automated systems, though a growing share are now driven by bots.

Malicious activities cause issues for marketers that look like:

Ad spend drained by fraudulent clicks
Fake leads consuming sales time and distorting CRM data
Inflated traffic metrics creating false confidence in campaigns
Retargeting audiences polluted with bot sessions
Attribution skewed across every channel

When bot traffic and invalid traffic shape your numbers, every decision built on those numbers is compromised. Bad traffic creates bad data. Bad data creates bad decisions.

What Malicious Activity Actually Looks Like to Your Business

"My traffic doubled overnight and I have no idea why"

A Shopify merchant reported recurring spikes of roughly 6,000 visits every 3–4 days, always arriving between 3 and 4 AM, all bouncing immediately from data center IPs in Ashburn, Virginia. Their first instinct was to question their own setup. The real cause was malicious bot activity scraping the homepage for competitor pricing. Meanwhile, those fake sessions had been triggering retargeting pixels, so the merchant was paying to re-engage visitors who were never human.

A sudden spike in "direct" sessions with near-100% bounce rates and zero-second durations is rarely genuine interest. It is one of the most recognizable signatures of bot traffic.

"Loads of traffic, zero sales"

Another merchant described 12,000 sessions in a single day with zero sales. Advice flooded into landing pages and targeting. But as a Shopify community advisor noted, a bounce rate above 90% is a near-certain indicator of bot traffic, not a product or targeting problem. The merchant wasn't asking whether they were experiencing malicious bot activity. They were asking why their ads weren't working and getting the wrong diagnosis entirely.

"A massive spike in direct traffic, a 90% bounce rate and no idea what caused it"

A marketer posted to the Adobe Analytics community after noticing a large and unexplained traffic surge. The visits were all appearing as "direct" and were accompanied by a bounce rate above 90%. An abnormal spike in direct traffic paired with a very high bounce rate is a near-certain signature of bot activity. Bots don't store cookies, so every session registers as new. Bots don't pass referrer data, so every visit looks like direct.

What Is Invalid Traffic (IVT)?

Invalid traffic is any traffic that does not originate from a genuine human visitor: bots, automated scripts, click farms, data center sessions, and fraudulent ad interactions. Because IVT is not generated by real people, it cannot become a customer or generate revenue.

IVT rarely announces itself. It typically appears as direct traffic with high bounce rates and near-zero session times. Left unfiltered, it corrupts every metric it touches. However, not all IVT is bad. There are bots that fall under IVT that are entirely harmless or can even be beneficial.

Is Malicious Activity the Same as Bot Activity?

Not always. Bot activity is automated behavior; malicious activity is harmful intent. Many bots like search crawlers, uptime monitors and accessibility tools are entirely legitimate.

Malicious bot activity specifically covers click fraud, ad fraud, credential stuffing, content scraping, fake form submissions, fake account creation, and affiliate fraud. The challenge is distinguishing malicious bot activity from beneficial automation.

Why This Is Getting Harder to Detect

Modern bots can simulate realistic typing, solve CAPTCHAs, and complete multi-step forms. AI is accelerating this. The businesses most at risk are often those misreading malicious activity as a conversion problem, a targeting problem, or a product problem when the traffic itself was never real.

Identifying and removing malicious bot activity produces cleaner data, more accurate reporting, better-qualified leads, and decisions grounded in what is happening.

Find Out How Malicious Activity is Wasting Your Spend

You are wasting some part of your budget on malicious activity. The question is how much. Anura offers a free traffic audit that will identify how much of your traffic is fraudulent and which sources it is originating from. With Anura’s 99.999% accuracy guarantee, you can confidently cut bad spend off at its source so you can allocate better, optimize, drop ROAS and make more money.

FAQ

How can bot traffic affect SEO performance?

Bot traffic can distort engagement metrics that marketers often use to evaluate content performance. Large volumes of non-human visits may inflate pageviews while simultaneously increasing bounce rates and reducing average session duration. Although search engines generally filter known bot activity, inaccurate analytics can lead businesses to make poor SEO decisions based on misleading data.

Can malicious traffic impact email marketing campaigns?

Yes. When fake users submit forms, subscribe to newsletters, or create accounts using automated tools, email databases can become filled with invalid contacts. This can lower engagement rates, increase bounce rates, and make it harder to evaluate the effectiveness of email campaigns.

What industries are most affected by malicious bot activity?

Any business that relies on digital marketing, lead generation, ecommerce, or online account creation can be affected. However, industries such as ecommerce, financial services, insurance, healthcare, SaaS, and affiliate marketing often experience higher levels of malicious activity because fraudsters can monetize those interactions more easily.

What is the difference between suspicious traffic and confirmed malicious traffic?

Suspicious traffic exhibits unusual characteristics that may indicate automation or fraud, such as abnormal browsing behavior or traffic patterns. Confirmed malicious traffic has been identified as fraudulent through behavioral analysis, device intelligence, network indicators, or other verification methods. Not all suspicious traffic is malicious, but it often warrants investigation.

Why does malicious traffic often appear as direct traffic?

Many automated systems do not pass referral information or maintain browser attributes in the same way human users do. As a result, analytics platforms may classify those visits as direct traffic. Large spikes in unexplained direct traffic are often one of the first indicators that further investigation is needed.

Can malicious activity affect attribution reporting?

Yes. Fraudulent clicks, fake sessions, and automated interactions can enter attribution models and receive credit for conversions they did not influence. This can cause marketers to overinvest in ineffective channels while undervaluing channels that are driving genuine customer activity.