Malicious PDF — malware analysis report

Static analysis result for SHA-256 98316b3648b6b67e…

MALICIOUS

PDF

38.8 KB Created: 2021-05-14 10:03:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bb8890d50b90fd143d7eb5891d46a107 SHA-1: 6e34adcb59e199d3abb30309583f0813173db037 SHA-256: 98316b3648b6b67ea865b8961db2c739df0c7d96b9ca420d20bccedcf6cffd79
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a clear lure for "Free Robux" and a call-to-action button, directing users to a suspicious URL. The heuristic 'SE_SECRET_RECOVERY_LURE' suggests the document may also attempt to harvest credentials or sensitive information under the guise of account recovery. No scripts were extracted, but the embedded URI and lure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 4

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/free-robux-com-2021-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000331a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x331A 29188 bytes
SHA-256: 28082d6d721030d7dfc250ee727703d94e5768c3bd48ea956328cc315d4ea5bc
font_01_sfnt_off00007554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7554 18676 bytes
SHA-256: db7deb15448d884d15c6a42f746ab8a768d26593fd7e085f0109997e06cd96ff

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