Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d33acf3bb80504…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 06:49:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9ef62e46534a7b13ce98feb03546e7b6 SHA-1: a12565804c494f9333e5b05c481f1015f03b9f26 SHA-256: c9d33acf3bb8050469cf2603fdebb8164bf8f619c284df2126b79ee648791b7d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites that are flagged as malicious redirectors, specifically promoting 'game hacks' and 'free generators' for popular games like Coin Master and Roblox. These links likely serve as a lure to direct users to potentially harmful content or further stages of an attack. No scripts were extracted, but the presence of malicious links and the 'game hack' lure strongly suggest a phishing or social engineering 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-bonus-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/robuxmatchcon_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-generator-no-human-verification-or-offers_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-100-real_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-do-you-get-roblox-builders-club-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-awards_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-message_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/cheat-codes-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-hack-other-players-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/hacks-for-build-a-boat-for-treasure-roblox-infinite-blocks_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/real-free-stuff-roblox_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_off0000301c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x301C 23204 bytes
SHA-256: 4ca0126527b680826a79cb8333812f2ef6ab004de882518466a9f7cce301b27d
font_01_sfnt_off00006452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6452 18192 bytes
SHA-256: 347f92f2c72f5474204f432aaed390864ecedce221811ee40a58a8bd6de89a14

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