Malicious PDF — malware analysis report

Static analysis result for SHA-256 4556bf8e8c8f96d5…

MALICIOUS

PDF

45.0 KB Created: 2021-05-16 07:38:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 620b2192f7b5522f441f20674732f067 SHA-1: 44e1210eac423c6b4d5ee0d51ca3a7e322c42cd6 SHA-256: 4556bf8e8c8f96d570debb927960cf17d5f34aad38b4835f29966ced890b1f79
82 Risk Score

Malware Insights

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

The sample is a PDF document that displays a fake CAPTCHA to lure users into clicking a link. The embedded URL, https://netcdn.xyz/app/406889139/fbchampion-game-hack, is likely the initial stage of a download or exploit chain. While no scripts were directly extracted, the PDF structure and ML classification strongly indicate malicious intent, possibly involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/406889139/fbchampion-game-hack
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/free-robux_GM431946152.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/how-to-get-coin-master-free-spins-in-email_GM406889139.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/coin-master-hack-tool-generator_GM406889139.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/free-robux-hack-us_GM431946152.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/roblox-hack-ga_GM431946152.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/coin-master-hack-no-verification_GM406889139.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/free-roblox-avatar_GM431946152.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/coin-master-hack-com_GM406889139.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/roblox-free-robux-no-human-verification_GM431946152.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/pasos-para-hackear-coins-master_GM406889139.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/rblx-gg-free-robux_GM431946152.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/free-robux-rewards_GM431946152.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/free-robux-glitch-2021_GM431946152.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/is-roblox-free-on-ps4_GM431946152.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-promo-codes_GM431946152.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/roblox-com-free-robux_GM431946152.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-fast_GM431946152.pdf
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/minecraft-toys-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a07.bin
cd01568bcf99f0d812b381a0e4369423883c616fb2d7c482478cff27afdf26a2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A07 25048 bytes
font_01_sfnt_off000083b6.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83B6 2840 bytes
font_02_sfnt_off00008d67.bin
a6b0af27d4d3b45433f1bf9322c4fc5530f0836706fea914cb1eef9ee3408c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D67 18364 bytes

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