Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd9469251b9b5c0…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 07:08:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3f3c5ce77a293e09719497e1dd73c0e7 SHA-1: 57d3748b6c7163d128e0894ead293c4597a117a7 SHA-256: ecd9469251b9b5c076cd544c8ca4229486102d083403c93cca01987392624683
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 users into interacting with it, which is a common social engineering tactic. It contains multiple embedded URLs, including one pointing to a potential payload download. The ML classifier also flagged this PDF as malicious, increasing confidence in its malicious intent. No scripts were extracted, but the presence of external URLs and the fake CAPTCHA strongly suggest a phishing or malware distribution attempt.

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.online/app/431946152/no-scam-free-robux-game-hack
    • http://simon-skov-fougt.dk/billeder/coin-master-spin-ml_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/how-to-get-free-robux-games_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/free-robux-codes-2021-real_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/coin-master-hack-no-verification-ios_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/google-how-do-you-get-free-robux_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/give-me-free-robux_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/coin-master-hack-tuts_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/uprobuxcom-free-robux_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/hack-coin-master-343-apk_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/roblox-robux-codes-2021_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/show-me-how-to-get-free-robux_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/free-money-and-spins-coin-master_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/minecraft-bedrock-server-hosting-free_GM479516143.pdf
    • http://simon-skov-fougt.dk/billeder/give-me-robux-now_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/i-cant-get-free-spins-coin-master_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/how-to-get-minecraft-for-free-ios_GM479516143.pdf
    • http://simon-skov-fougt.dk/billeder/oprewards-com-earn_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/20-free-spins-coin-master_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/coin-master-free-pet-food-links_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050ff.bin
0599f0320f99d299399bb0931a7e58b29c36942bf2437d506e7e0ab01dec3faf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50FF 25816 bytes
font_01_sfnt_off00008daa.bin
028f53d29b1a624cb68bae5e747b7c177b5cbf8f783d4c53e2642c12f49f399d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAA 18500 bytes

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