Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc91182c79b4e62f…

MALICIOUS

PDF

33.6 KB Created: 2021-07-21 20:11:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: db4d1c4ef661bd8b8698b505f473c6c5 SHA-1: 65d661229e7f2727d9ab2d46dd77bf1f5abb51c9 SHA-256: dc91182c79b4e62f497778e5b7ca07b221bdfedf381c13fdf24f79e32f3b5f31
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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/free-robux-no-human-verification-or-survey-or-download-game-hack PDF link annotation
    • http://elibrary.uniyap.ac.id/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-tiktok-likes-without-verification_GM835599320.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/coin-master-free-spins-2021_GM406889139.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_off00002ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BA2 22032 bytes
SHA-256: b6d19a7abf802637c890359731c9ec7905e65d7b2e022d3f900d6ef894220c03
font_01_sfnt_off00005c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8D 19920 bytes
SHA-256: 318d114cafd7cea48f1a11f27c957389fae6c279952253c490b27c84185ff225

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