Sometimes you can figure out scammer from his Webpage - standart template, Web page can be free of charge, without any contact address. Sometimes scammer Webpages also have outdated information.
And it is always useful to look at the Whois information about the domain name of the site. If the domain has just been registered, it is a warning sign. The recent scam HybridMixer was registered at GoDaddy (cheap Internet domain registrar)...
So if you see something like this:
Domain Name: hybridmixer.com
Registrar URL: http://www.godaddy.comRegistrant Name: Registration Private
Registrant Organization: Domains By Proxy, LLC
Name Server: NS1.DIGITALOCEAN.COM
Name Server: NS2.DIGITALOCEAN.COM
Name Server: NS3.DIGITALOCEAN.COM
DNSSEC: unsigned
stay away from it at all costs