Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab71be3d7624d082…

MALICIOUS

PDF

36.0 KB Created: 2021-06-25 17:26:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 331d529299e5a5af0b301544a0b75592 SHA-1: a79fdbd67d40f5b46dc044518dc632641bae1903 SHA-256: ab71be3d7624d082b0e3915b9e2528cb26811b8eb2d98c5c867bb63d7f1629c9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure of 'free Robux' and game hacks to entice users. It contains an embedded URL, http://netcdn.co/app/431946152/free-robux-ad-youtube-game-hack, which is likely a redirector to a malicious payload or exploit kit. The ML classifier strongly flagged this PDF as malicious, supporting the observed lure and embedded URL.

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.co/app/431946152/free-robux-ad-youtube-game-hack PDF link annotation
    • https://library.uigm.ac.id/repository/roblox-god-mode-cheat-engine-script_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-hack-dumb-brothers-roblox-accounts-easy_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/hacks-robux-gratis_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/counter-blocks-roblox-offensive-hacks-unknowncheats_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-hack-a-roblox-account-kazok_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/download-phantom-forces-roblox-aimbot-hack-script-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-hack-roblox-accounts-december-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/best-minecraft-hacked-client-2021_GM479516143.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_off0000328d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x328D 23308 bytes
SHA-256: 2ff65bf2c85472e5e0116f0b3b7890a0fd3d51ee854bc667d8e32a21782cb40c
font_01_sfnt_off0000674c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x674C 19156 bytes
SHA-256: 3a06af6dc2505d1db39b264b2e9db5e8022bc1cc34c664cc67f01f9b25e9db55

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