Malicious PDF — malware analysis report

Static analysis result for SHA-256 77baf8ca64513a86…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 14:10:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f409fe0cd996ec6804672b6aeee0b3bd SHA-1: 6b5821987ed2ed45054f82b568e5bddf679f7202 SHA-256: 77baf8ca64513a86eabf8bc0ba8eccee7e7fb29994dc4b89a78b560b2314b077
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA to lure the user into downloading a file, as indicated by the 'Fake CAPTCHA' heuristic and the presence of a download-related URL. The ML classifier strongly flagged this PDF as malicious, and the embedded URI points to a game hack client, suggesting a social engineering attack to distribute malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/479516143/minecraft-wurst-hacked-client-game-hack
    • http://perpus.poltekeskupang.ac.id//repository/minecraft-wurst-hacked-client_GM479516143.pdf
    • http://perpus.poltekeskupang.ac.id/repository/free-spins-and-coins-coin-master_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id//repository/minecraft-multiplayer-free_GM479516143.pdf
    • http://perpus.poltekeskupang.ac.id/repository/how-to-get-real-robux_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/free-robux-microsoft_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/master-coin-hack-apk_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/you-promised-my-son-free-robux_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/free-robux-script_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/free-robux-codes-2021-not-used_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/pubg-uc-shop-myanmar_GM1330123889.pdf
    • http://perpus.poltekeskupang.ac.id//repository/free-roblox-adopt-me-accounts_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id/repository/bloxpink-free-robux_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/tryrbx-site-free-robux_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id/repository/real-coin-master-hacks_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/instalar-roblox-free_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/free-spins-coin-master-hack-2021_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/free-minecraft-windows-10-with-java_GM479516143.pdf
    • http://perpus.poltekeskupang.ac.id/repository/huskybuckscom-free-robux_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-hack-without-verification-2021_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/free-robux-glitch_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051ba.bin
d2a09ade3c1e5a68c5464d9d0797b8aa286df50a365d441d8464ff36790636ab		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51BA 24784 bytes
font_01_sfnt_off000089fe.bin
7137e4e2e9658b649895b635d5af54e9ac78bb5b6b308aaf2a8e981e2e5df966		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FE 18324 bytes

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