Malicious PDF — malware analysis report

Static analysis result for SHA-256 b722c62f295bdff7…

MALICIOUS

PDF

42.7 KB Created: 2021-06-07 03:46:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8911509707c020a894b629730cd0b413 SHA-1: 5103b0f491710104aa3cb42778617a7f043d08de SHA-256: b722c62f295bdff7c9c60d0620803dfa4614f28ae3c3b44c1244628ac329e1c8
82 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA to trick the user into clicking a link, which is likely intended to download a malicious payload. The embedded URL points to a resource related to game hacks, suggesting a social engineering lure. No scripts were extracted, but the ML classifier and fake CAPTCHA heuristic strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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/robux-earn-free-game-hack
    • http://yowunpiyasa.lk/images/buy-robux-free_GM431946152.pdf
    • http://yowunpiyasa.lk/images/how-to-get-free-chest-in-coin-master_GM406889139.pdf
    • http://yowunpiyasa.lk/images/coin-master-hack-generator-tool_GM406889139.pdf
    • http://yowunpiyasa.lk/images/coin-master-daily-spin-link_GM406889139.pdf
    • http://yowunpiyasa.lk/images/minecraft-pe-free-download-ios_GM479516143.pdf
    • http://yowunpiyasa.lk/images/rewards-robux_GM431946152.pdf
    • http://yowunpiyasa.lk/images/coin-master-hack-tool-download_GM406889139.pdf
    • http://yowunpiyasa.lk/images/descargar-coin-master-hackeado_GM406889139.pdf
    • http://yowunpiyasa.lk/images/free-roblox-toy-codes-2021_GM431946152.pdf
    • http://yowunpiyasa.lk/images/coin-master-tricks_GM406889139.pdf
    • http://yowunpiyasa.lk/images/free-attacks-coin-master_GM406889139.pdf
    • http://yowunpiyasa.lk/images/how-to-get-free-robux-easy_GM431946152.pdf
    • http://yowunpiyasa.lk/images/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • http://yowunpiyasa.lk/images/free-robux-redeem-codes-2021_GM431946152.pdf
    • http://yowunpiyasa.lk/images/haktuts-coin-master-free-spins-2021_GM406889139.pdf
    • http://yowunpiyasa.lk/images/free-roblox-gift-card-codes_GM431946152.pdf
    • http://yowunpiyasa.lk/images/free-robux-no-verification_GM431946152.pdf
    • http://yowunpiyasa.lk/images/get-free-coin-master-coins_GM406889139.pdf
    • http://yowunpiyasa.lk/images/free-minecraft-hosting_GM479516143.pdf
    • http://yowunpiyasa.lk/images/minecraft-bedrock-edition-download-pc-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004c81.bin
c4391a2867fd512a01edc9681a6dd3740fc275c8be59708031063e71112898ef		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C81 24248 bytes
font_01_sfnt_off00008418.bin
a765ddc1c5049476c1d57e3a65caa5e60232b6811d6f0a0d5f0de2971f21f025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8418 18244 bytes

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