Not Auto and User Generated Stats in Catalog view of SQL Server
Those are the statistics created when index was created. Quoting from BOL Statistics 


  The Query Optimizer creates statistics for indexes on tables or views when the index is created. These statistics are created on the key columns of the index. If the index is a filtered index, the Query Optimizer creates filtered statistics on the same subset of rows specified for the filtered index. For more information about filtered indexes, see Create Filtered Indexes and CREATE INDEX (Transact-SQL).