It is important to understand that you a Social Security Number (SSN). SSNs are issued exclusively by the U.S. government through the Social Security Administration (SSA), and the application process is completely free . Attempting to purchase a number from a third party or using a "fake" number is a federal crime often associated with identity theft or fraud.
If you are eligible, you can obtain a number through these official steps: Foreign Workers and Social Security Numbers
Individuals authorized by the Department of Homeland Security (DHS) to work in the U.S., such as those on H-1B, J-1, or certain F-1 student visas. How to Apply Legally