Malicious PDF — malware analysis report

Static analysis result for SHA-256 b988ac8ea3aa0d1c…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 23:41:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 743fed3cb80665b034e1bfd7a0fc305b SHA-1: 9dff405e529f414989e85708d85c4b4604a7d284 SHA-256: b988ac8ea3aa0d1cf01422b39daa67a282fcccde290b124cb3cd36e8e657d9ea
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-severity heuristic indicating it links to a game hack redirector, specifically targeting users with lures for 'Coin Master Hack 2021'. The embedded URL, http://netcdn.tw/app/406889139/coin-master-hack-2021-android-game-hack, is the primary indicator of this malicious redirection. While no scripts were extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attempt to lead users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-hack-2021-android-game-hack PDF link annotation
    • http://gts.edu.gh/library/repository/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-piano-hack-script_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-bedrock-hacks-windows-10_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/get-robux-free-fast-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/can-you-buy-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-sell-a-free-model-on-roblox-studio_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-hack-roblox-without-getting-banned_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-jurassic-park-roblox-backpack_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/apoc-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-hack-infinite-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/earn-free-robux-roblox-game_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-noclip-hack-august-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/cheat-codes-for-assassin-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
stream_002_off00003207.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3207 22756 bytes
SHA-256: 9e8934c0df72d75ca76e51ff92b74e5e9053b07543262ce57d95369c8ee5b937
font_01_sfnt_off000064e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E3 18580 bytes
SHA-256: f67f88b1ce6c5db430876b5da8c68a5518a964090ab37f1ab5b5be580e390e4d

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