Bing advertisement URL exploit

I wanted to install Chrome on a new computer and used Bing to search for it (http://www.bing.com/search?q=chrome). The top link was an advertisement for a website which was reported as "google.com/chrome" by Bing, but when I clicked through I got redirected to http://www.googlechromedl.com/, a site which may or may not have a reputable download. It's also distributing (or claiming to distribute) an old version of Chrome.

http://archive.is/IBlU0 is an archive of the site, but it doesn't properly handle the advertisement link so you can't actually see where the link redirects to.

This seems like a pretty big security issue. I'd assume that Microsoft would verify that an entity owns a domain name before they allow said entity to register an ad claiming to link to that domain, but that seems like not the case.

I'm not sure how to get in touch with Microsoft. I couldn't find any information about reporting security issues online and I'm just a high school student so I don't have any connections or social media accounts like Twitter. I don't want to sign up for one either, so I'd appreciate it if someone here could get this information in the hands of someone who can fix it.

EDIT: Added a direct link to the Bing search.

The biggest issue is that there doesn't seem to be a simple way to report ad abuse.