Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc91330bc1808e0e…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 02:39:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d4a0e3db75e2b3dc31973edb4630ddc0 SHA-1: 3cf949ce4a3d06f7f7a38a2b5692c93d1eb978f2 SHA-256: dc91330bc1808e0e9e1f71ae7847ea6e4e8b895357871cabdfc3238ecc168385
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and embedded text related to game hacks and free currency, specifically targeting Roblox and Coin Master. The primary link, http://netcdn.tw/app/431946152/roblox-hacks-com-game-hack, is flagged as a redirector lure. While no scripts were extracted, the document's structure and content strongly suggest a social engineering tactic to drive users to malicious websites, likely for malware distribution or credential harvesting.

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/431946152/roblox-hacks-com-game-hack PDF link annotation
    • http://opac.kolejkrim.edu.my/repository/bimsqa-complex-gives-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/rom-cheat-codes-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-hack-stella-working_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-passwords-with-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/icloud-the-cheating-app-for-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-password-generator-free-download_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/hackear-coin-master-sin-root_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-hack-apk-35-11_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/all-robux-promocodes-no-hacking_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-car_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-easy-website_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-c9m_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/blue-banded-tophat-gives-you-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-hack-paintball-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-codes-without-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/pubg-uc-key_GM1330123889.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/www-robux-com_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_off00002e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E18 22536 bytes
SHA-256: add6e85d2740bc5c7ff40c518ee7715294d15612e5f0fe433116884957664564
font_01_sfnt_off0000601c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x601C 18916 bytes
SHA-256: 5602ec78d0973736e8df03d49b0c299d43ad09969882d8f10ad3423cf39d9468

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