Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac677188f5844b21…

MALICIOUS

PDF

46.1 KB Created: 2021-06-07 07:49:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 053ea149df979d810cb630ba85f34b44 SHA-1: 779824b6ce8b6a48307e899a89eeb9062c57b556 SHA-256: ac677188f5844b21f500b9b4a23ca5e1b43bb0966c706d33707020ee4b15e844
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-severity heuristic firing indicating it links to a 'free generator / game hack' redirector. The embedded URL, https://netcdn.tw/app/431946152/youtube-live-free-robux-game-hack, is directly referenced in the document body and heuristics. This suggests a social engineering lure to trick users into visiting a potentially malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/youtube-live-free-robux-game-hack PDF link annotation
    • http://repository.unla.ac.id/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/haktuts-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-robux-no-hacks-needed_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/easy-points-gg_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/ispoofer-pokemon-go-free-key_GM1094591345.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-cp_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-earn-robux_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_004_off000053ba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53BA 26768 bytes
SHA-256: 25528a769976acaeaa5da3479575a455b51709da7b298ee56d6a8171cd584971
font_01_sfnt_off00009114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9114 18512 bytes
SHA-256: 2f767df8c5fc6e0e0299452e4bd311f3f627d8b82e75759ba73a95c487fee211

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