Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc4beeb1bf09e46…

MALICIOUS

PDF

55.3 KB Created: 2021-06-11 10:04:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ba610bf8b3ed8df5b295a45a693762b0 SHA-1: 30c25eb0dfab9cca674a19209fc8dfd2c3ddb385 SHA-256: ffc4beeb1bf09e46cb2642a2a1c6988bb45d2791fddbe5b2076283eab1f2e6e0
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into clicking a link. This link, 'https://netcdn.tw/app/431946152/how-to-get-free-clothes-on-in-roblox-game-hack', likely leads to the download of a second-stage payload. The presence of numerous similar URLs further supports a malicious intent to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9649

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.tw/app/431946152/how-to-get-free-clothes-on-in-roblox-game-hack
    • http://www.library.umbjm.ac.id/repository/hack-admin-thr-roblox-2021_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/free-robux-com-real_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-unlimited-robux_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/minecraft-free-download-laptop_GM479516143.pdf
    • http://www.library.umbjm.ac.id/repository/roblox-cheat-engine-bypass-sandbox_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/how-to-get-robux-for-free-no-hacks-2021_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/roblox-free-no-download_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/free-minecraft-mods-for-ps4_GM479516143.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/rbxoffers-com-free-robux_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/boku-no-roblox-hack_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/free-robux-without-human-verification_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/free-robux-group-payouts_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/roblox-hack-app_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/robux-free-online_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/roblox-games-free_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005486.bin
6d42133d70c3e7e23bb88675cc179584542144c5c21e857a9cc1699dcb28fd17		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5486 40268 bytes
font_01_sfnt_off0000ac12.bin
94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC12 2824 bytes
font_02_sfnt_off0000b5c1.bin
e9007d48b67fffe6497f478db91139ea518a0f2f512917d3b22a55a8277ed507		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C1 18384 bytes

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