Full story here:The ads served by Bing and Google along with your search results are linking more and more often to sites trying to infect your machine.
Neither Bing nor Google effectively prescreens these bogus advertisers, so it's up to us to detect and avoid them.
You may recently have used either Google or Microsoft's new Bing search engine to find the popular Malwarebytes Anti-Malware utility. If so, chances are good that the sponsored ads alongside your search results contained links to the very malware that the security tool is designed to remove.
Sponsored search results lead to malware