This appears to be an image content delivery network (CDN) for CBS. Mostly, it seems to be sports images from CBSSPorts.com, but there are probably images from other CBS sites as well. It does not appear to be malicious.
From the website: "Listen, search, or share, our network combines world class digital music assets that reflect and define the ways people consume music today. From personalized music discovery on Last.fm, to the #1 lyrics destination on the web; Live and webcast events to mobile apps, gaming, and music platforms, CBS Interactive Music Group is a playground of interactive music experiences."