Do you know who this ad.spreamedia.it and : exploit toolkit website intrusion

Dear Friends od the Norton forum,
It is normal for while i use the computer of my father, which I emphasize twice, use computers for work and recently sailed with him comes the Norton firewall alert?:


Web attack: exploit toolkit website
intrusion of ad.spreamedia.it


Do you know who this ad.spreamedia.it
If the firewall is configured Stealt visibilii because you are on the net?
Thanks