Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf433a5cc479ed9…

MALICIOUS

PDF

33.0 KB Created: 2021-07-20 16:30:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 225c9dd6864ee31d7ea5d072b6f75f23 SHA-1: bd82c0bef53e6ab2e7b1174ffd22573e5c2f81ed SHA-256: bdf433a5cc479ed91fb75191bacf45475ca18020e96089177fa2de27ac818611
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document displays a fake CAPTCHA or human verification prompt, a common social engineering tactic to trick users into clicking malicious links. The embedded URL and document body content strongly suggest a lure for free Robux, which is a common theme for scams. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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 http://netcdn.tw/app/431946152/rbx-free-robux-game-hack
    • https://perpustakaan.unitomo.ac.id/repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdf
    • https://perpustakaan.unitomo.ac.id/repository/free-disney-plus-accounts-tiktok_GM835599320.pdf
    • https://perpustakaan.unitomo.ac.id/repository/roblox-land-free-robux_GM431946152.pdf
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-roblox-promo-codes_GM431946152.pdf
    • https://perpustakaan.unitomo.ac.id/repository/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdf
    • https://perpustakaan.unitomo.ac.id/repository/free-tiktok-followers-no-downloads_GM835599320.pdf
    • https://perpustakaan.unitomo.ac.id/repository/how-to-hack-to-get-robux_GM431946152.pdf
    • https://perpustakaan.unitomo.ac.id/repository/get-free-tiktok-likes_GM835599320.pdf
    • https://perpustakaan.unitomo.ac.id/repository/tiktok-likes-for-free_GM835599320.pdf
    • https://perpustakaan.unitomo.ac.id/repository/coin-master-claim-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002c88.bin
59cc2a9063bea82dcfbcaa522e74d51875feaf409f7bf313c5c30d75cde4a88d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2C88 22676 bytes
font_01_sfnt_off00005f25.bin
ddd37c3b2fa686acce6c2a3c2ceddf9a56a39c36e5e1dfb8773daba355b1b632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F25 18200 bytes

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