Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c85a706111d9e64…

MALICIOUS

PDF

44.8 KB Created: 2021-06-13 19:50:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2f92316e1bdb2ce95e687bc9981bf884 SHA-1: defc46f47685f22115c170ce19a0a995c232af46 SHA-256: 6c85a706111d9e642093b28cea9dc668bdcf6a0860349e78117c96b0c172b7d2
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 0.9980

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/roblox-free-robux-hack-com-game-hack PDF link annotation
    • http://library.fk.upnvj.ac.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-free-followers_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/pubg-uc-and-rp-generator_GM1330123889.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-gift-links-2021_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-app-play-games-earn-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/descargar-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/pokemon-go-free-pokecoins-xyz_GM1094591345.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/wrd-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-thumbnail_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
stream_003_off0000493c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x493C 30792 bytes
SHA-256: e9cb161d244dd9f6b2f25cbbfb48a887acd6f4b6c63eafa54f0513e19da45502
font_01_sfnt_off00008be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE1 18744 bytes
SHA-256: 187eee8e131d68fda1e831f0aabe17926cf1e20d4a1200c0f3a487417684e589

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