Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a01cce8e0e27615…

MALICIOUS

PDF

35.3 KB Created: 2021-05-21 02:49:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 87275d4a95e00eacba15cd4dfcb9c898 SHA-1: c90162fc861612c1e09911025abcfdff27a357bc SHA-256: 2a01cce8e0e27615a465535261761788b1e4cb61924fff5d6328518f360c36dc
82 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA lure, directing the user to click on an external URL to access content. This URL, https://netcdn.xyz/app/835599320/watch-tiktok-for-free-game-hack, is likely intended to lead to the download of a second-stage payload. The document also contains numerous other embedded URLs that may serve similar purposes. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/835599320/watch-tiktok-for-free-game-hack
    • https://www.kaojen.com.tw/upload/files/feb-23-2021-free-coin-master-spins_GM406889139.pdf
    • https://www.kaojen.com.tw/upload/files/free-coins-coin-master-link_GM406889139.pdf
    • https://www.kaojen.com.tw/upload/files/real-free-spins-for-coin-master_GM406889139.pdf
    • https://www.kaojen.com.tw/upload/files/free-spins-on-coin-master-without-human-verification_GM406889139.pdf
    • https://www.kaojen.com.tw/upload/files/robuxmatch-com-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003101.bin
fa3f650eaa0c0f824582b90cc54b680e82cc904eea811ddd32d5baf1e5d4e684		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3101 24540 bytes
font_01_sfnt_off00006971.bin
536dd0f2ccb369fb0f75028f7438263e518d9053b8109dbcfe1c6d16044e23ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6971 18048 bytes

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