Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f78d3a400992d20…

MALICIOUS

PDF

35.7 KB Created: 2021-07-05 03:01:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6601e2b187bedce6c14859bc6909e33f SHA-1: e7c0f6cdbc8bcf0305ecfcf37427c309e4ac9f4f SHA-256: 6f78d3a400992d20958cc609712ef8dd39ad9437f7fdb4dfeef266505191bfd0
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, with a primary lure pointing to a 'robux online game hack'. This suggests a social engineering tactic to trick users into visiting malicious sites, likely for credential harvesting or malware distribution. The ML classifier strongly indicates maliciousness, and the presence of game hack lures is a common phishing technique.

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/robux-online-game-hack PDF link annotation
    • http://www.elibrary.perludem.org/repository/roblox-hack-tools-in-all-games_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-hack-how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-buy-stuff-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-free-username-changer_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/enter-this-secret-code-for-5m-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-1-million-robux-cheat_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-rich-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-phantom-forces-hack-2021-august_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/robux-generator-2021-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/hack-100-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/skrillix-wolf-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/link-coin-master_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_off000035ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35EA 22352 bytes
SHA-256: 4b1d172dd5805f93196f5e8316421f110e84dd88e46e9336663c93420239d2bc
font_01_sfnt_off00006782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6782 18744 bytes
SHA-256: 0d65403b238a7007715d414cecaabb3c72f82c70eaf60aa0c41e152bd513deae

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