Tenant wants to pay upfront in cash only

Prospective tenant is willing to pay x3 the normal rent for 1 months stay and in all cash. Is this a red flag? They're visiting from Saudi so I wonder if this is the norm. Anyone had experience with this kind of situation?

submitted by /u/Immediate-Albatross7
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source https://www.reddit.com/r/RealEstate/comments/us6vog/tenant_wants_to_pay_upfront_in_cash_only/