Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4549aecfff439df…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 00:46:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2bd851b093af0eed338bb39532710403 SHA-1: e8d82e7e990f4983cce3d962ae448c85514817f0 SHA-256: b4549aecfff439dff6a326e5f597b10d6246aa3ea55f61c8de93f2874c99a24e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures for popular games. The primary redirector URL is http://netcdn.tw/app/431946152/roblox-free-items-glitch-game-hack. This indicates a social engineering attack designed to trick users into visiting potentially harmful sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/431946152/roblox-free-items-glitch-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/more-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/collect-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/giving-away-free-toy-codes-for-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-codes-reveiw_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-clothes-cheat-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-no-websites_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-unlimited-free-robux-on-roblox-2021-jefftec_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/robux-cheats-without-a-survey_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-money_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_off00002f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F81 22840 bytes
SHA-256: 3757e3d75b5eea16741bde8d5cfe2fbc99506bbe946f1d868aa595076786faaf
font_01_sfnt_off00006255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6255 19300 bytes
SHA-256: 69d2c72b6fad46034d218509eb31c7a9b6e4ffa15011304f4c9b6feca00e8b8a

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