Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f51a8c6e4b239f…

MALICIOUS

PDF

35.4 KB Created: 2021-07-03 16:08:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 68e0f3669d03220ea336adf074c39f21 SHA-1: a1f680733e3a3396b8ddb4c7e1cc7359d8197bea SHA-256: b4f51a8c6e4b239f63e196fdb700e503823ab6bc41ed0f5f5bbc97d0757a42f9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as game hack generators and free spin offers. The embedded URLs, such as http://netcdn.tw/app/406889139/coin-master-free-spins-link-blogspot-april-2021-game-hack, are designed to lure users into clicking, likely leading to further malicious content or downloads. No scripts were extracted, but the document's structure and embedded links strongly indicate a phishing or malware distribution attempt.

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/coin-master-free-spins-link-blogspot-april-2021-game-hack In PDF document text
    • http://librarysenior.com//repository/moon-active_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-roblox-accounts-with-robux-2021_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_off000030d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D5 23288 bytes
SHA-256: ab616306bcbb891adf211f2077df4206ce30c5147dabb4e4f06fab52e8903446
font_01_sfnt_off00006569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6569 19036 bytes
SHA-256: ef972ac8b6f0d301ec64deecd99ee3108bd9315cf8785a49d8f43646f678be13

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