Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40c0727ebce8821…

MALICIOUS

PDF

46.3 KB Created: 2021-05-12 23:39:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f7e5eaff2ce5be0e206d8c5c256ee180 SHA-1: 0454c425f709e2e8f107cdde4f4fb60ed48ceeb9 SHA-256: a40c0727ebce88211bb151d49b780b8ebf82522d40349fd32dc21da66925324f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document presents a fake CAPTCHA lure to trick users into interacting with malicious links. The embedded URLs point to resources that likely host further malicious content or scams. The ML classifier strongly flagged this PDF as malicious, supporting the observed social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/406889139/coin-master-code-for-free-spins-game-hack
    • http://apx-centre.ru/images/coin-master-free-spins-links-2021_GM406889139.pdf
    • http://apx-centre.ru/images/minecraft-free-download-windows_GM479516143.pdf
    • http://apx-centre.ru/images/free-robux-no-generator_GM431946152.pdf
    • http://apx-centre.ru/images/google-how-do-you-get-free-robux_GM431946152.pdf
    • http://apx-centre.ru/images/free-minecraft-alts_GM479516143.pdf
    • http://apx-centre.ru/images/level-coin_GM406889139.pdf
    • http://apx-centre.ru/images/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://apx-centre.ru/images/coin-master-free-coins--spins_GM406889139.pdf
    • http://apx-centre.ru/images/how-do-u-get-free-robux-2021_GM431946152.pdf
    • http://apx-centre.ru/images/free-money-links-coin-master_GM406889139.pdf
    • http://apx-centre.ru/images/how-to-actually-get-free-robux_GM431946152.pdf
    • http://apx-centre.ru/images/play-roblox-for-free-on-google_GM431946152.pdf
    • http://apx-centre.ru/images/earn-robux-today-earn-robux-today_GM431946152.pdf
    • http://apx-centre.ru/images/coin-master-free-spins-app_GM406889139.pdf
    • http://apx-centre.ru/images/roblox-free-robux-hack_GM431946152.pdf
    • http://apx-centre.ru/images/roblox-mobile-hack_GM431946152.pdf
    • http://apx-centre.ru/images/60-free-spins-coin-master_GM406889139.pdf
    • http://apx-centre.ru/images/coin-master-hack-2021_GM406889139.pdf
    • http://apx-centre.ru/images/free-coin-master-spins_GM406889139.pdf
    • http://apx-centre.ru/images/how-to-hack-coin-master-using-es-file_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004f97.bin
a734add52c6b5d4d90b1514913085263c6602ee583f5f6f86d31d90ae4578fe1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F97 31064 bytes
font_01_sfnt_off0000937f.bin
4a03a9d44c164768d834a7fabe993e3d55008b9c253aea1e1300b795f74bd62a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x937F 18060 bytes

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