Malicious PDF — malware analysis report

Static analysis result for SHA-256 0823d1950a0c6a06…

MALICIOUS

PDF

46.1 KB Created: 2021-06-09 15:38:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 415563763e4de5999c9ea9669444a676 SHA-1: b85dd143c4bde957f197cd70446144a9d93c0da6 SHA-256: 0823d1950a0c6a06b636eb9e14bf07008e0a7d4bb5182e2f2d1e4a785f1c3096
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA to trick the user into interacting with it, which is a common social engineering tactic. The embedded URL points to a resource that likely serves as a lure for downloading further malicious content. While no scripts were directly extracted, the PDF structure and heuristics suggest an attempt to exploit user interaction for malicious purposes, potentially leading to client-side execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/how-to-get-free-robux-on-phone-2021-game-hack
    • http://librarysenior.com/repository/free-robux-wheel_GM431946152.pdf
    • http://librarysenior.com/repository/how-to-hack-someones-roblox-account_GM431946152.pdf
    • http://librarysenior.com//repository/coin-master-cheat-apk-free-download_GM406889139.pdf
    • http://librarysenior.com/repository/roblox-script-hack-epic-minigames_GM431946152.pdf
    • http://librarysenior.com//repository/picture-roblox_GM431946152.pdf
    • http://librarysenior.com//repository/coin-master-gift-link_GM406889139.pdf
    • http://librarysenior.com//repository/how-do-u-get-free-robux-2021_GM431946152.pdf
    • http://librarysenior.com/repository/coin-master-free-spins_GM406889139.pdf
    • http://librarysenior.com/repository/roblox-group-free-robux_GM431946152.pdf
    • http://librarysenior.com//repository/coin-master-free-download-for-pc_GM406889139.pdf
    • http://librarysenior.com/repository/is-minecraft-free-on-xbox_GM479516143.pdf
    • http://librarysenior.com/repository/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdf
    • http://librarysenior.com/repository/free-coin-master-spins-without-human-verification_GM406889139.pdf
    • http://librarysenior.com//repository/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdf
    • http://librarysenior.com//repository/free-spin-coin-master-link-today_GM406889139.pdf
    • http://librarysenior.com/repository/free-robux-no-verification-no-survey_GM431946152.pdf
    • http://librarysenior.com/repository/coin-master-free-coins-2021_GM406889139.pdf
    • http://librarysenior.com//repository/is-it-possible-to-hack-coin-master_GM406889139.pdf
    • http://librarysenior.com//repository/http-coin-master-hack-club_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005380.bin
dd30952501779205eb6fb0fd596cac1bff092c0b83b5f7f1ff49f62fbbf5094a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5380 25736 bytes
font_01_sfnt_off00008f83.bin
9143e9c063c8a9c8d6296be3e5503e9365326e279c6efd0fa2ab6b1a3dcd35cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F83 19004 bytes

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