Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78fae7631c22c0a…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 22:28:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a985ec11408e5407314f457981daf3d4 SHA-1: 1726f46177d8020b562f9fcebf249f402d5a6a31 SHA-256: b78fae7631c22c0ad87baf7c115d98998701e3afedcde46f20f8bd44b58a43ef
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, with one prominent URL pointing to a potential download for game cheats. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The document body and embedded URLs suggest a lure for users seeking in-game advantages, likely leading to the download of a secondary payload.

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/406889139/free-spins-coin-master-october-17-2021-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/is-bloxburg-roblox-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-teapot-turret-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-vehicle-tycoon-cheats_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/pokemon-go-free-install_GM1094591345.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/robux-hack-no-verifaction-or-passord_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hoiw-to-get-free-robux-on-promotion_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-teasure-hunt-simulator-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021-november_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-tiktok-25-likes_GM835599320.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/wwe-backpack-roblox-free_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_off00003094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3094 22900 bytes
SHA-256: f98b3a8f294e33fa16d0b3a01e888052aec3c7ab4660cc56fa7ad33ca3d98e0f
font_01_sfnt_off000063fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FE 18788 bytes
SHA-256: 65f4803c8f051d412bbbbbb7dd72e981990fef64dbb6576893c251839893721c

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