Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7bd3a9a2fe4fc0…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 20:26:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-19
MD5: 21ae760730c94a3257d8e540c9bdfe23 SHA-1: caf86c3419553ae85d811594a6b4f8d11d775b32 SHA-256: cd7bd3a9a2fe4fc0a82a6136720dfcf554ffa8756f91051c6b5e50e151688fa8
160 Risk Score

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/how-to-gift-robux-on-mobile-game-hack In PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/beyblade-evolution-hack-script-roblox_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-robux-legit-2021_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/hack-de-allah-akabar-roblox-download_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/roblox-electric-state-hack_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/coin-master-official-page_GM406889139.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/robux-free-c_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/roblox-phantom-forces-dll-hack_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-robux-obby-uncopylocked_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/cheats-for-super-power-training-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-fashion-frenzy-roblox_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-gamepass-in-any-games-roblox_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-get-free-roebucks_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_off0000316c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x316C 21892 bytes
SHA-256: 7926d283165792a9ec9667d444717c38b56d3174fcd863fd299259c06258e395
font_01_sfnt_off000061a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A9 19212 bytes
SHA-256: bc5fdf2573ba02d8ebbd4383ba1ec7dafda423df0baa75127e805848098bb58d

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