Read about Pyramid & Ponzi schemes. a 4k profit on 100k translates into an annual return of 48 percent. There is no legitimate way to turn such profit in Pakistan.
In Ponzi schemes a person gathers money and promises handsome returns. He continues to pay his existing and new investors until the total pool of fund becomes so big that one day he runs away with all the money. Such schemes at times also hire sales agents on hefty commissions to avoid direct contact with the clients. When they run away, investors run after sales agents who have no clue what to do but the money is gone. It is one of the oldest frauds in history and its sad to see people still falling for such scams.
There are no shortcuts to earning honest money.