Malicious PDF — malware analysis report

Static analysis result for SHA-256 776cb5d2f5fee839…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 03:35:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b4e739002dd3c12012a994b12a0df83d SHA-1: 0e9225185464c340ecda38ff0daf25294948dc32 SHA-256: 776cb5d2f5fee839765ada11d9d3727150649788ce153ac6d7a8a317876e3e5f
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/406889139/master-coin-hack-app-game-hack PDF link annotation
    • http://gts.edu.gh/library/repository/wurst-18_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-coffre-vesteria-free-weekend_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hack-roblox-system48_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/weird-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/robux-xyz_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-robux-on-android-without-human-verification_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/www-free-hats-roblox-generator_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-home_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/real-free-robux-games-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-cheat-engine-noclip-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/easy-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hacking-roblox-robux-codes_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-money-on-pet-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hacks-para-wall-por-el-chat-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-daily-free-coins-link_GM406889139.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_002_off000032c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32C6 23296 bytes
SHA-256: 52790a73944d3f7bfb2f2c6af8fcccb208c83e3165314ba6667cffa32c882e29
font_01_sfnt_off0000670f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x670F 18180 bytes
SHA-256: 7bd10482523747762d14b11b19cc03829bec2525ea32b9abd6d12ec6249f4c5e

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