it's the same if you put:

Access Denied

You don't have permission to access "http://www.mtgox.com/img/pdf/insolvency1-Announcement.backup" on this server.
Reference #18.721d434d.1393326101.7a50edc5

or this:

Access Denied

You don't have permission to access "http://www.mtgox.com/img/pdf/insolvency11000-Announcement.backup" on this server.
Reference #18.721d434d.1393326165.7a528caf

True dat:

https://www.mtgox.com/img/pdf/fukkenanything.backup

Same Access Denied... seems to work for *.backup