Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4a58a5e4bae5b4…

MALICIOUS

PDF

33.5 KB Created: 2021-07-05 22:26:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 93d831b0755d911b39ddf9f2337636ca SHA-1: 0acf0b48a563b89f361ca347c2d3978e4c3e59c8 SHA-256: ba4a58a5e4bae5b4633afccf15ad76f65ca93c8a3a8f1c6acdae614394abd9b6
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.tw/app/431946152/earn-free-robux-game-hack PDF link annotation
    • http://library.ft.upnvj.ac.id/repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-pet-food-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/roblox-sin-hacks_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-tiktok-bots_GM835599320.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-to-get-free-robux-june-2021_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/best-working-roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/inspect-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/synapse-roblox-free-trial_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/roblox-roblox-escape-room-cheats_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_off00002d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D93 22280 bytes
SHA-256: 022a9a5093b5ea96a41414255bab248d3838e479e5af4283d8294e64ed453e7b
font_01_sfnt_off00005ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF3 18716 bytes
SHA-256: 8f38c6e249cfb46641478d2db6e31ecd999c597cf7db8b591ffee8c5f62f2864

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