Malicious Website Blocked

Yesterday I attempted to access a users manual through software that I use.  I got a pop-up message that the site was a known malacious site.  I am attaching a snapshot of the message that I received.

I know that Make-the-Cut is not a malicious site.  I think that this could be a false positive. Is the "malicious web site" the Amazon S3 cloud?  I am assuming what probably happened is someone put something malicious on the Amazon cloud site that got detected and it marked the whole s3.amazonaws.com site as malicious.  I know that Make-The-Cut is not a malacious site.  Is there anyway Norton can detect what site is malacious and just mark that site as malacious?  I am assuming the answer to this question is yes, but I would like to know.

Thank you.