The calendar file is appears legit (it's a text file, not a binary), but has an advertisement link for what I assume is some offshore betting site as well as ebay seller links in the description of each event.
Example:
BEGIN: VEVENT
DTSTART:20060827T000000Z
SUMMARY:Washington at New England. Buy or sell a ticket to this game.
LOCATION:New England
TRANSP: TRANSPARENT
SEQUENCE:0
DESCRIPTION:Buy or sell a ticket to Washington at New England.\nhttp://www.dpbolvw.net/click-1636071-10281826\n\nPut your money where your mouth is by picking the New England Patriots to win!\nhttp://www.anrdoezrs.net/click-1636071-3483748\n\nFind New England Patriots gear on ebay. \nhttp://www.anrdoezrs.net/click-1966372-5463217?loc=http%3A//search.ebay.com/search/search.dll%3Fht%3D1%26from%3DR4%26satitle%3DNew+England+Patriots%26sacat%3D64482%2526catref%253DC6\n\nOr at an online Store:\nhttp://www.33shops.com/index.php?catid=5\n\nGet your favorite college football team's schedule here.\nhttp://www.vbbitman.com/index_files/CollegeFootball.htm\n\nFind great deals on eBay using Lost Auction.\nhttp://www.vbbitman.com/\n\n* Game times subject to change.\n
PRIORITY:5
CLASSrivate
CATEGORIES:New England Patriots
End:VEVENT
R
