Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c29d6495105ccce…

MALICIOUS

PDF

42.3 KB Created: 2021-05-17 06:01:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d62d5ab8c716ddea855ebb3b47babda9 SHA-1: bcf7ff5dfdffaee7b236e2880dd20b79dfec792f SHA-256: 3c29d6495105ccceae479014150ac78cbcb7ada1eafae41da101842439d19e55
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick users into interacting with malicious content. It contains numerous embedded URLs, including one pointing to 'netcdn.xyz', which likely serves as a lure for a second-stage payload or phishing attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-apps-that-work-game-hack
    • https://www.colditex.com/images/free-spins-for-coin-master-game_GM406889139.pdf
    • https://www.colditex.com/images/free-robux-only-username_GM431946152.pdf
    • https://www.colditex.com/images/how-to-get-free-robux-2021_GM431946152.pdf
    • https://www.colditex.com/images/does-roblox-premium-expire_GM431946152.pdf
    • https://www.colditex.com/images/free-robux-no-verification-no-survey_GM431946152.pdf
    • https://www.colditex.com/images/coin-master-free-coins-link_GM406889139.pdf
    • https://www.colditex.com/images/how-to-hack-people-in-roblox_GM431946152.pdf
    • https://www.colditex.com/images/como-hackear-coin-master-en-espaol_GM406889139.pdf
    • https://www.colditex.com/images/free-robux-easy_GM431946152.pdf
    • https://www.colditex.com/images/free-robux-no-human-verification_GM431946152.pdf
    • https://www.colditex.com/images/minecraft-hax-download-no-virus_GM479516143.pdf
    • https://www.colditex.com/images/download-hacked-games-coin-master_GM406889139.pdf
    • https://www.colditex.com/images/facebook-coin-master-free-spins_GM406889139.pdf
    • https://www.colditex.com/images/free-spins-coin-master-2021_GM406889139.pdf
    • https://www.colditex.com/images/free-spins-on-coin-master-without-human-verification_GM406889139.pdf
    • https://www.colditex.com/images/best-hacked-client_GM479516143.pdf
    • https://www.colditex.com/images/como-hackear-coin-master-espaol_GM406889139.pdf
    • https://www.colditex.com/images/free-spin-links-coin-master-october-30-2021_GM406889139.pdf
    • https://www.colditex.com/images/coin-master-free-spins-hack-iphone_GM406889139.pdf
    • https://www.colditex.com/images/get-me-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004803.bin
66f0ed0897b69fc4aec46299a1c66d6c527c156a4efdd9e41d403ba7756ce4ec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4803 24940 bytes
font_01_sfnt_off0000808b.bin
867cc7ed7a05e00a705c8433c5324c57a550f7e7678a2e8c50298e1974253cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x808B 19056 bytes

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