Malicious PDF — malware analysis report

Static analysis result for SHA-256 031df436c8f228dd…

MALICIOUS

PDF

32.8 KB Created: 2021-07-21 11:30:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c79766186b8210f8ee9c29d6026657d1 SHA-1: d1800d0cb82724a5c0a47ffe27aaa5727aa0c047 SHA-256: 031df436c8f228ddccda427a8c58bf0ac31ab33feb8590fd31d4eaf2cf4a72e0
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a critical heuristic firing for a game hack redirector lure, pointing to a known malicious URL. The document body also contains text and a call-to-action phrase related to accessing a generator, reinforcing the lure. The embedded URL is the primary indicator of malicious activity, likely leading to a further stage of compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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 http://netcdn.tw/app/406889139/how-to-get-free-spins-for-coin-master-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_002_off00002b24.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2B24 23384 bytes
SHA-256: 73cf707bde176ad9a9747eb398ba05ee81bc2f78f19d640bdd8ef9c611fb3e3d
font_01_sfnt_off00005fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB4 18052 bytes
SHA-256: 3cfae0e628493b06a11893ba870a091d0c1d4835c1ebffdd70b8f2a1c7d637a9

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