About confirmation of authenticity of the offer letter

Hi everyone,


I'm from India , few days back I had an interview for the post of civil Site Engineer through one of the Consultancy from Kolkata, after 2days of interview (Company name:- Redhin Construction) recieved an offer letter via company mail offered salary was 1600 USD but don't know why I think it's fake please help me find out about this company . Interview mode was normal telephonic call interview.

If they pay for everything it's probably ok

If they ask for money for anything , it's a scam