Malicious PDF — malware analysis report

Static analysis result for SHA-256 51feeb8d2fc0c856…

MALICIOUS

PDF

36.3 KB Created: 2021-07-09 14:47:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8d6b612e59da5451f66c2f3145c95153 SHA-1: 8aadb490189f58cccf79ea867e1cc0da7e124e3a SHA-256: 51feeb8d2fc0c856597d8dc776263aae485a899126700cd288f1935ae26b994c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document employs a lure of free game currency and hacks to entice users to click on embedded links. The primary link directs to a known malicious redirector, which likely serves as a gateway to further malicious content or downloads. The document's content and embedded URLs strongly suggest a phishing or scamming attempt, masquerading as a helpful resource for popular games.

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/master-free-spin-and-coin-links-html-m-1-game-hack In PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/online-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/robux-free-72-claim_GM431946152.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/free-robux-mod-roblox-2021-pc_GM431946152.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/free-robux-no-survey-no-download-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/free-robux-flame_GM431946152.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/rape-simulator_GM431946152.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/how-do-i-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://sisomdethospital.com/ckfinder/userfiles/files/coin-master-online-hack-tool_GM406889139.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
stream_002_off00003470.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3470 23496 bytes
SHA-256: 0ef2c3c36d5fce6335aae8edaab45d3c268716a8731f70bb84aca7765d01b443
font_01_sfnt_off0000699b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x699B 18956 bytes
SHA-256: 85e071f9d2d9aba7decae53ba293d7c98952cf6adb5dc147492857e3bbfc39de

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