Pay-per-click (PPC) is one of the most common forms of online advertising, which is loved both by advertisers and the publishers. Unfortunately, PPC is somewhat vulnerable to frauds, mainly the click fraud. This is a kind of scam that relates to the use of various techniques with the purpose of increasing the number of clicks on the advertisement. In order to increase the number of clicks, the perpetrators are using a script or an application that acts like a genuine visitor. Sometimes, the same is done manually by clicking on the ad without having any actual interest in what its promoting.