If you landed on ddmap.com expecting a working website, you got a blank 404 error instead. That alone tells you everything: the site is essentially offline. A legitimate business or service would have a proper homepage, not a bare nginx error page.
What little we can see isn't reassuring. The domain has been registered since 2005, so it's old, but age alone doesn't make a site safe. The bigger problem is the complete lack of security — the site doesn't support HTTPS at all, meaning any connection is unencrypted and vulnerable to tampering. There's also no contact information, no about page, and no privacy policy. For any site that claims to offer a service, those missing pieces are major red flags.
Is ddmap.com a scam? There's no evidence of fraud, but there's also no evidence of anything legitimate. The site is unreachable over HTTPS, returns only a 404, and has no visible operator. The safest assumption is that this domain is parked or abandoned. Don't enter any personal information, don't try to download anything, and don't click links from it. There's nothing here worth trusting.