The Serious Fraud Office has laid charges against failed property developer Glenn Cooper.
It's the second investigation into the 39-year-old's dealings.
He's been charged six counts of dishonestly using a document.
All the transactions involve members of one family, totalling nearly $835,000.
The SFO alleges Mr Cooper purchased properties at mortgagee sales, then on-sold them at an increased price.
Investigators believe he usually targeted investors who were under pressure to consolidate debt.