Malicious PDF — malware analysis report

Static analysis result for SHA-256 865610afb64ded48…

MALICIOUS

PDF

31.3 KB Created: 2021-07-20 16:14:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 35283b9cad06e8ff481e1bdb6330ff89 SHA-1: 645fb9df34755b9c0e8bbcac6e1f570970e8775f SHA-256: 865610afb64ded48988beb3d267259f58fa048a1b9c65d3b668c6aba462fdf78
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link disguised as a game hack generator, intended to lure users into downloading a payload. The document body explicitly contains the phrase 'CLICK HERE TO ACCESS COIN MASTER GENERATOR' and the malicious URL. While no scripts were extracted, the heuristic firings strongly indicate a social engineering lure leading to a download.

Machine Learning

  • Nyx PDF Classifier clean score 0.0580

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/coin-master-free-spins-daily-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_off000025ba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x25BA 22788 bytes
SHA-256: af005bb9f3708ce233deff9f427a9163b76bd11a340555900ead034d6efe1917
font_01_sfnt_off000058e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58E1 18308 bytes
SHA-256: 220bb6194b1ab8a2bb399ca4a862914ac8d15b354bb0df2c737bc67699221dc9

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