The IP for that DNS name appears to be 63.240.10.222. You could add a statement to your outside interface ACL rejecting traffic from that IP on port 80 (or just all IP traffic), or add a statement on your inside interface ACL rejecting traffic to that IP on port 80 (or all IP traffic).
On the inside interface:
access-list my-list deny ip any host 63.240.10.222.
You may be able to simply shun that IP using shun 63.240.10.222. I have not used the shun command before though, so your mileage may vary.
