Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfff81ffb7abdecf…

MALICIOUS

PDF

44.3 KB Created: 2021-05-19 01:32:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9eaa604b6e4bd5a1a342c2b518994050 SHA-1: cf52881ecb9320fd09081b6a439809b6f22fef47 SHA-256: dfff81ffb7abdecf6aca569666e1db340f00a73b43a49ea7f21bd9e141591ad3
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA lure to deceive users into interacting with a malicious link. This link, 'https://netcdn.xyz/app/431946152/cute-free-hair-on-roblox-game-hack', likely leads to the download of a second-stage payload. The presence of embedded URLs and the ML classifier's high confidence score support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/cute-free-hair-on-roblox-game-hack PDF link annotation
    • http://repository.poltekkesjakarta3.ac.id/repository/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/earn-rbx_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/wurst-115_GM479516143.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004aea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AEA 27492 bytes
SHA-256: cb80604034832a16f1f46f427261402231d9a6364c3216bf7a93710f30db5f55
font_01_sfnt_off00008a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4A 18540 bytes
SHA-256: 488c37b81cb6318595a8d643f53454b31d34364b68f61b3c1daecc568804ddf5

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