Ad fraud software in action. Target website, randomized referrers, browser agents and proxy IP addresses. That is enough to spoof anti-bot software.
It is no secret that I battle and ban bad bots on my site. If a bot is not a well known search engine or provides me some type of service then I usually ban it. Sure it can visit my site, but it will receive a blank page. But why do they visit? Who is paying them? Welcome to the world of Online Ad Fraud.