Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4f8e40ec5c5f69…

MALICIOUS

PDF

46.1 KB Created: 2021-06-13 23:21:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f0ac3fbe8b04d0faa51aa415ed804ec7 SHA-1: 7313a9c24fb8fb5e48dc70325fff9847da8ed7cd SHA-256: cf4f8e40ec5c5f6924a72714e663cb54d6b8e98082ce31efdedfc64f7d699c10
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a URL promising game hacks and free in-game items, a common lure for phishing or malware distribution. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of multiple malicious-looking URLs and the lure suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.co/app/431946152/how-to-make-a-cool-free-roblox-avatar-game-hack PDF link annotation
    • http://www.vetmed.fkh.unair.ac.id/repository/coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/roblox-free-download-ps3_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/roblox-free-clothes-template_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/roblox-hub-free-robux_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/hacks-para-roblox-descargar-jailbreak_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/wwwhacks-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a90.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A90 25592 bytes
SHA-256: dca16b44c7df4d84a40e23f32bdc2c2231de79d7921c3598cb375f7e3896114f
font_01_sfnt_off000085e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85E6 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00008f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F85 18924 bytes
SHA-256: 948beea9b0b62979526be556d031fca0c18b91cf4e7582a89286e4d075dbf8f7

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