Malicious PDF — malware analysis report

Static analysis result for SHA-256 be44d40afc4e4469…

MALICIOUS

PDF

34.7 KB Created: 2021-07-07 10:20:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d30e946cb612667b26ddba48933f80d9 SHA-1: 2b0ed3808e92f8444211d9299d0fe4a2e81c03ce SHA-256: be44d40afc4e4469ec49b818b3452cd80289754b615d5f32d9071d68369c8639
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game hacks and generators. The primary lure URL is http://netcdn.tw/app/406889139/free-spin-coin-master-app-download-game-hack. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest a malicious intent to redirect users to potentially harmful content or further stages of an attack.

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-spin-coin-master-app-download-game-hack In PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/roblox-cheatus-limited_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/free-roblox-anti-afk_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/tiktok-free-2021-views_GM835599320.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/enter-a-code-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/cheats-on-natural-disaster-survival-roblox_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/how-to-make-a-free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/how-to-get-free-robux-on-chromebook-2021_GM431946152.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • http://www.gyfunnews.com/ckfinder/userfiles/files/how-to-get-more-robux-for-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_off000031ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31CA 22452 bytes
SHA-256: 165e392d6deebbea82afaca714a9e22b9b9a004c14db5e1c9bbfea51dde28799
font_01_sfnt_off000063a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A8 18756 bytes
SHA-256: 5ddeee92078a18a9ce538fcc67bef45dcef09506aba632bc2469329d8d7e1d8a

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