Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4e947394310cdf…

MALICIOUS

PDF

35.0 KB Created: 2021-06-28 04:01:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ca58f983442be5d63253634973b779a5 SHA-1: 8fb2e847c9b166cdb91cfe3a1f18b780a9b41a62 SHA-256: 3f4e947394310cdfe03e4d566770c4e66415a55828699f36520f274ff353ace7
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for 'free Robux' and displays a fake CAPTCHA, indicating a scam or phishing attempt. It links to a URL that promises game hacks, which is a common tactic for distributing malware or leading users to fraudulent sites. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-get-free-robux-ios-no-human-verification-game-hack PDF link annotation
    • https://lib.insan-unggul.ac.id/repository/roblox-install-free_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/what-is-robux_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-group-free-clothes_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-tiktok-hearts_GM835599320.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-hack-client-2021-february_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-hacked-twitter_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-roblox-skins-stampylongnose_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_off0000326d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x326D 21744 bytes
SHA-256: 8766ea3b32cd23c1832a400e29e1eb229f563f4397b98c931f9b46f06adfb645
font_01_sfnt_off00006256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6256 19496 bytes
SHA-256: 7fceb6df9a9e3c88b06a43679dd65b795feb4bff50b5bc8ee2d24e2bebe0ff0b

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