Malicious PDF — malware analysis report

Static analysis result for SHA-256 b136b82431522619…

MALICIOUS

PDF

34.9 KB Created: 2021-07-01 23:58:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c9b4a57be146d584b99c4e9ea84a4f12 SHA-1: 2d1f8e20a5ea702374c2d2e7fa534279f3145c6d SHA-256: b136b8243152261996bd883e82f777f84f465c70a1e70916fca6427db8a079b6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to 'robux-hack-generator-2021-game-hack', which is identified as a malicious redirector. The document body and heuristics indicate a lure for game-related cheats or currency, likely leading to a phishing or malware download site. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.co/app/431946152/robux-hack-generator-2021-game-hack In PDF document text
    • http://repository.ummy.ac.id//repository/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-attack-block-hack_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/artmoney-roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-progamers_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-bear-mask-for-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/best-free-script-injector-for-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-roblox-admin-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/como-hackear-a-cualquier-jugadores-de-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/paginas-para-hackear-usuarios-en-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/rob-hacker-online-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-hat-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/cheat-roblox-robux-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-noclip-hack-2021_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_off00002f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F10 23048 bytes
SHA-256: 9f0ab97361d579a3c1bb52bd2d6da018323e5c2c3cd774c84e17fe733eba7d8b
font_01_sfnt_off000062a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A7 19228 bytes
SHA-256: 313f34c6e2569a91dfc35f23d5628cfdfd640a7793371c9ea9f3b6c8c9313482

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