Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99ea2187bfadc9a…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 19:09:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2de4c53c0f0bd95aade8c338b6eed185 SHA-1: 1e30c362b0d684f156045f7947b82f88174f1649 SHA-256: b99ea2187bfadc9ad2c2da27f199600b21aa63fff5fac3e1e10a1397178402d1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites that are either known malicious redirectors or host lures for game hacks and exploits. The heuristic firings indicate the document is designed to redirect users to potentially harmful content, likely as part of a phishing or scam campaign. No scripts were extracted, but the embedded URLs and document content strongly suggest a social engineering 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/coin-master-daily-rewards-link-game-hack In PDF document text
    • http://sttlets.education/senayan/repository/how-to-hack-into-roblox-accounts-using-a-cookie-editor_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-hack-other-roblox-account_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/doge-roblox-hat-free_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/hack-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/robux-codes_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/free-800-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/bandit-roblox-exploiter-for-free_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-player-points-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/coin-master-hack-mobile_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-hack-into-a-roblox-account-without-password_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-ios-gods-hack_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-ftw_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-roblox-hack-without-human-verification_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-cheat-excecuter_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
stream_002_off000032a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32A8 22564 bytes
SHA-256: d6ccca27cf85756d8993ae92fbcdbcc5802c2184e72ba7cd744a15dbf2df8620
font_01_sfnt_off000064c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64C0 18764 bytes
SHA-256: d7ae46f5c05d17a3888d42bd8d81f580db9882425b157d36228d301a60f1f6c8

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