Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfa12e29276cbfc…

MALICIOUS

PDF

41.9 KB Created: 2021-05-24 08:52:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 28f8ed448795f91dd2c9b455a22b155c SHA-1: 4b6f5c311d72ecda7d51430e17ff7d0bd9cff62a SHA-256: 7cfa12e29276cbfc4327fdb0b329f9d446c7a6fa02791287964377b8a5bd9531
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for game cheats, directing users to a known malicious redirector. The embedded URL is a primary indicator of this phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a malicious redirector workflow designed to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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-coins-on-coin-master-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002fec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FEC 24456 bytes
SHA-256: 09453961646d5dd2b17e1267cc3f5f971e0b243554f304740059e4735dcfef88
font_01_sfnt_off00006820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6820 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00007200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7200 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_03_sfnt_off00008419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8419 17712 bytes
SHA-256: 6ea46f87f2167b805a87cbef3ad9b5ecf4d2513d7b8c5fe933be1d22f28e2546

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