Odd webpage loading after inactivity

Once my PC has been sitting with Chrome running but no activity for a few minutes, I get a blank webpage opening(sometimes multiples)

Norton 360 doesn't appear to notice it but it's a bit suspicious looking. URL is http:/ /static.bumytuzyciq.com/ag/?d=60A44C622FEEE498___z=1___rd=1cc4b53ca19f494188a387db41e48fe9

I always close it but has anyone else noticed this?