Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87fba19e9c1cddf…

MALICIOUS

PDF

34.4 KB Created: 2021-07-08 21:59:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-17
MD5: 0ce8803c1175dfdba9a1bfc8ce3b3869 SHA-1: 7a52c9454e3483e77a573240c8bc691e9ae7c338 SHA-256: f87fba19e9c1cddfeed02e83a5e0863cddc603cd4ba9a419e8f5b50fb428a412
200 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/coin-master-34-5-hack-game-hack In PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/pokemon-go-windows-free-download_GM1094591345.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-free-spin_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-robux-robloxbloob_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-anti-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/robux-free-tips_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-hack-with-cmd_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/easy-how-to-get-free-robux_GM431946152.pdfIn macro / runtime command snippet
    • https://www.lincolnec.edu.np/userfiles/files/hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-bear-hacks_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/114-4-hacks_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-robux-generator-no-tan_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/who-type-of-roblox-hack-is-the-best_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/robux-online-free_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-robux-without-downloading-anything-2021_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/fIn macro / runtime command snippet
    • 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_off00002f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F51 23424 bytes
SHA-256: 0829f257a2267ae4c149945c3e6a5a48be8d6b2b6be52c487b95f5116b9d6510
font_01_sfnt_off00006377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6377 18376 bytes
SHA-256: 454748033da4f0fb466ea71bb3633c38fd13d37d387cf2400721ec0bcd849771

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