Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcaf2b9db750516e…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 22:03:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 21a9081afa0ec082ef909e2bdcfc3679 SHA-1: a898a3b8394b54946222552e93312bb83f597351 SHA-256: bcaf2b9db750516e5c64702a740899c5f409b00f4fa7089b45a1ce475fc93043
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free currency to trick users into clicking malicious links. The primary link directs to a known malicious redirector, which in turn hosts further PDFs, likely as part of a multi-stage download or phishing campaign. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/431946152/roblox-got-talent-piano-hack-game-hack In PDF document text
    • http://110.232.83.89/slimsppks/repository/coin-free-spin_GM406889139.pdfPDF link annotation
    • http://110.232.83.89/slimsppks/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/hack-coin-master-net_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/como-utilizar-cheat-engine-en-roblox-2021_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/iluminate-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/www-rbx-com_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/world-zero-hack-roblox_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/how-to-get-a-free-doge-pack-in-roblox_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-dominus-hat-roblox_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/150-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/i-want-free-robux_GM431946152.pdfIn 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
font_00_sfnt_off00002dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DFB 22236 bytes
SHA-256: f6cb3e1be16661ee630c2b7308dfad425c2048e579b70f2589a2d0ead32ee926
font_01_sfnt_off00005f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F90 19032 bytes
SHA-256: ceb6b6676ad0bc53fab19b8d7e907d465d751d2ce602378615980930f57ff6e8

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