help... Virus on my blog? Error in webpagetest

Hello everyone

sometimes, in some tests I run inwebpagetes.org I get a waterfall with thousands of requests (see this examples:

http://www.webpagetest.org/result/151121_R8_T3Z/1/details/

When I analysed this test link, I saw many references to geo-um.btrll.com. I google it and it seems it is a virus…

Can you help me figure it out what’s wrong, please? How can I solve this?

Thank you
Margarida