Malicious PDF — malware analysis report

Static analysis result for SHA-256 51aabaa5c015bf8b…

MALICIOUS

PDF

48.8 KB Created: 2021-05-11 03:03:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 28752ea0bdc8bfe44bda4634f5f32b9d SHA-1: 6cdaeee664e9990bb6151827b3b72e8a049a4e2c SHA-256: 51aabaa5c015bf8b6b4ab57731ed6cd3d87da72447f5350b18805f5f20aa6cc8
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The document displays a fake CAPTCHA and includes a call-to-action phrase, strongly suggesting a lure to trick users into clicking embedded links. The primary embedded URL, https://netcdn.xyz/app/431946152/how-do-u-get-free-robux-game-hack, likely leads to a malicious download or further phishing content. The ML classifier also flagged this PDF as malicious with high confidence.

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/431946152/how-do-u-get-free-robux-game-hack
    • http://studentslovetravel.com/images/wwwcoin-master-free-spincom_GM406889139.pdf
    • http://studentslovetravel.com/images/play-coin-master-for-free_GM406889139.pdf
    • http://studentslovetravel.com/images/coin-master-free-spins-daily-2021_GM406889139.pdf
    • http://studentslovetravel.com/images/coin-master-daily-spin-free_GM406889139.pdf
    • http://studentslovetravel.com/images/hacks-for-roblox-prison-life_GM431946152.pdf
    • http://studentslovetravel.com/images/minecraft-ps4-code-free_GM479516143.pdf
    • http://studentslovetravel.com/images/how-do-you-get-free-robux-2021_GM431946152.pdf
    • http://studentslovetravel.com/images/play-minecraft-free-online-no-download_GM479516143.pdf
    • http://studentslovetravel.com/images/links-for-coin-master-free-spins_GM406889139.pdf
    • http://studentslovetravel.com/images/coin-master-link-for-spins_GM406889139.pdf
    • http://studentslovetravel.com/images/minecraft-cheats-switch_GM479516143.pdf
    • http://studentslovetravel.com/images/coin-master-free-spins-5-10-2021_GM406889139.pdf
    • http://studentslovetravel.com/images/apps-for-free-robux_GM431946152.pdf
    • http://studentslovetravel.com/images/free-robux-com-2021_GM431946152.pdf
    • http://studentslovetravel.com/images/blogger-coin-master-free-spins_GM406889139.pdf
    • http://studentslovetravel.com/images/how-to-hack-roblox_GM431946152.pdf
    • http://studentslovetravel.com/images/free-robux-for-free_GM431946152.pdf
    • http://studentslovetravel.com/images/free-robux-without-human-verification-2021_GM431946152.pdf
    • http://studentslovetravel.com/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://studentslovetravel.com/images/coin-master-update-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c45.bin
e15ec26ec48d26dd84d97b24e1ea6156d07b762037e6ca9252082ae40b95a737		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C45 36828 bytes
font_01_sfnt_off00009bb7.bin
ab6f51fdb1eed883fd21dff3bd0336e3a1b816e6c21a8924207bfe84ed9a007e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BB7 18636 bytes

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