Malicious PDF — malware analysis report

Static analysis result for SHA-256 db73b4bda3e551dc…

MALICIOUS

PDF

40.5 KB Created: 2021-05-21 13:02:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1a2af5e687b6105ea79a266f641872b1 SHA-1: 7d683ac9f8b6ad9db038656f241ec42b078466ac SHA-256: db73b4bda3e551dc7ff5ab8744a853563129acc91913ec034dd0e535cc83050f
82 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA or verification prompt to trick the user into interacting with it. It contains an external URI pointing to a suspicious URL, likely intended to host a malicious payload or redirect to a phishing site. The ML classifier also flagged this PDF as malicious, increasing confidence in its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7718

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/lazyblox-com-free-robux-game-hack
    • http://aimp-market.ru/images/how-to-hack-a-minecraft-server_GM479516143.pdf
    • http://aimp-market.ru/images/how-to-hack-minecraft-pe_GM479516143.pdf
    • http://aimp-market.ru/images/oprewards-com-earn_GM431946152.pdf
    • http://aimp-market.ru/images/coin-master-free-link-today_GM406889139.pdf
    • http://aimp-market.ru/images/multiplayer-master-hack-coins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000325c.bin
ae46a4a97c86215864955d550aa9b7ffef134b2c4630ae4bfdd5be04bca7069c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325C 26668 bytes
font_01_sfnt_off00006e97.bin
40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E97 3884 bytes
font_02_sfnt_off00007b3e.bin
c7a12f46af2ab2e47f5138dce66a585f9a7928693d977e55c66cac0a0236f754		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3E 18840 bytes

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