Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edf641937ee8e03…

MALICIOUS

PDF

43.4 KB Created: 2021-05-14 16:39:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7dc1bdc896f915ee9ef3307ea9417d82 SHA-1: ac98cf7786d0cf46754c3a142587dcd24312685d SHA-256: 3edf641937ee8e0327424db6f4192aada92e2eb4a91d0d98e03a92281bdefd9b
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA lure to trick users into interacting with embedded links, which likely leads to the download of a second-stage payload. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent. No scripts were extracted, but the PDF structure and embedded links suggest an attempt to exploit user interaction for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/free-robux-codes-no-verification-2021-game-hack
    • http://standart-lab.ru/images/ww-roblox-come_GM431946152.pdf
    • http://standart-lab.ru/images/roblox-lovenet_GM431946152.pdf
    • http://standart-lab.ru/images/coin-master-hack-lost-world-2021_GM406889139.pdf
    • http://standart-lab.ru/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdf
    • http://standart-lab.ru/images/free-robux-survey_GM431946152.pdf
    • http://standart-lab.ru/images/free-spin-link-coin-master_GM406889139.pdf
    • http://standart-lab.ru/images/get-free-spins-from-coin-master_GM406889139.pdf
    • http://standart-lab.ru/images/coin-master-games-hack_GM406889139.pdf
    • http://standart-lab.ru/images/free-robux-no-verification-needed_GM431946152.pdf
    • http://standart-lab.ru/images/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdf
    • http://standart-lab.ru/images/how-to-hack-m-coins-mcpe-master_GM406889139.pdf
    • http://standart-lab.ru/images/how-to-get-hacks-on-minecraft_GM479516143.pdf
    • http://standart-lab.ru/images/collect-free-spin-linms-coin-master_GM406889139.pdf
    • http://standart-lab.ru/images/roblox-troll-outfits-free_GM431946152.pdf
    • http://standart-lab.ru/images/coin-master-daily-free-spins-hack_GM406889139.pdf
    • http://standart-lab.ru/images/how-do-u-get-free-robux-2021_GM431946152.pdf
    • http://standart-lab.ru/images/roblox-army-free-robux_GM431946152.pdf
    • http://standart-lab.ru/images/coin-master-mod-free-download_GM406889139.pdf
    • http://standart-lab.ru/images/coin-master-free-coins_GM406889139.pdf
    • http://standart-lab.ru/images/free-robux-place_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004acb.bin
f6bcb566af533f05bc4a06b7ce8d1cb50f8934d07946bbc4d03f52b61b33a264		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ACB 25192 bytes
font_01_sfnt_off0000848a.bin
db1e34f64d78c47646929d75ef8e7d82dfccacc985d29653851fea35b3c0bf96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x848A 19176 bytes

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