Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f1a592fd808966…

MALICIOUS

PDF

35.3 KB Created: 2021-06-26 01:14:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 137bc01d9dae9eb0eeabd3deed222b3d SHA-1: 7bfc6287c1f8b11f835c61a77dc50937b35abf88 SHA-256: 83f1a592fd808966bcbbaf0fbb72b03daeccc6b89e60d87916b5680a7bf3a099
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as 'free generators' or 'game hacks'. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure the user to a malicious site, likely for further exploitation or malware delivery.

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/free-robux-app-pc-game-hack In PDF document text
    • https://library.iuli.ac.id/repository/generation-for-free-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-roblox-clothes-boy_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/descargar-hack-deathrun-roblox-super-speed_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/awesome-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-roblox-heads_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-play-online-free_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-how-to-upload-custom-thumbnails-for-free_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/when-do-hackers-hack-roblox_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/como-hackear-robux-en-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-free-spins-iphone-2021_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-free-robux-hack-real_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/my/tasksIn 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_off000032d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32D6 22516 bytes
SHA-256: 46e028e7c3e1982cec4b71d452b4ea2c004b1b26c0860d53371671b043d14d83
font_01_sfnt_off0000653e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x653E 19048 bytes
SHA-256: 7a0ec386577517012780854155c3c26af80fb2bae943cfecf555b21e43cce5fb

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