Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81c79d3e0d28e7b…

MALICIOUS

PDF

36.8 KB Created: 2021-05-17 17:35:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 98c9a42c62761211fde2e60058252544 SHA-1: a12f53b6bceda15fe97eb67ff8c810668fc332e7 SHA-256: f81c79d3e0d28e7b29bc92fa1c8cfd0ce464f36cfcc3284adbee418db0f34e04
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link that redirects to known malicious infrastructure, masquerading as a 'free generator / game hack'. This lure is intended to trick users into visiting a potentially harmful site. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to drive traffic to malicious sites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/406889139/free-spins-and-coins-coin-master-2021-link-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003540.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3540 24744 bytes
SHA-256: e1ed228bff22f28ac43db4ef70d47ab8bbd533bbf70e2cf4cf84b87a08b8fb9c
font_01_sfnt_off00006d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4A 18632 bytes
SHA-256: e5cba94a653a55f068ca82f0c7712f51eecd5e3013a204785266329deafd7ed1

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