This is Cuban numbers station M08a, they have a regular schedule on this frequency that starts at 2300z. Of course, as with anything the Cubans do that start time is "about", it is often a few minutes early or a few minutes late.
This station uses "cut numbers" for its transmission, and it sends 5 figure groups. So that the number group 53678 would be WDRIG.
T = 0
A = 1
N = 2
D = 3
U = 4
W = 5
R = 6
I = 7
G = 8
M = 9
Any other characters you have in the body of the transmission are likely transcription errors. Any groups in the message body smaller or larger than 5 figures are likely transcription errors.
T!