Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff44abe02c39970d…

MALICIOUS

PDF

42.1 KB Created: 2021-05-12 11:34:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b73827938989a4e547dee54c5de8267a SHA-1: bc6b37c71519d67ce43707b9c2d26b346e69aea0 SHA-256: ff44abe02c39970dd0574ac58cceaec495310041f2d1271954b3d865b16abf9d
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick users into interacting with it, a common social engineering tactic. It contains multiple embedded URLs, one of which is directly linked to a heuristic firing for external URI usage. The ML classifier strongly indicates maliciousness, suggesting the document is designed to lead the user to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/roblox-moderators-game-hack
    • http://aessentia.com/images/free-spins-on-coin-master-game_GM406889139.pdf
    • http://aessentia.com/images/roblox-system_GM431946152.pdf
    • http://aessentia.com/images/robux-no-verification_GM431946152.pdf
    • http://aessentia.com/images/free-robux-wheel_GM431946152.pdf
    • http://aessentia.com/images/coin-master-facebook_GM406889139.pdf
    • http://aessentia.com/images/coin-master-free-spins-link-today-blogspot_GM406889139.pdf
    • http://aessentia.com/images/oprewards-free-robux_GM431946152.pdf
    • http://aessentia.com/images/coin-master-free-spins-link-today-hack_GM406889139.pdf
    • http://aessentia.com/images/minecraft-pe-hack-client-ios_GM479516143.pdf
    • http://aessentia.com/images/free-robux-no-human-verify_GM431946152.pdf
    • http://aessentia.com/images/how-to-free-robux_GM431946152.pdf
    • http://aessentia.com/images/flame-gg-free-robux_GM431946152.pdf
    • http://aessentia.com/images/earn-robux-com_GM431946152.pdf
    • http://aessentia.com/images/wahoogaming-co-free-robux_GM431946152.pdf
    • http://aessentia.com/images/coin-master-free-spins-a2z-help_GM406889139.pdf
    • http://aessentia.com/images/minecraft-mac-free_GM479516143.pdf
    • http://aessentia.com/images/roblox-free-bundles_GM431946152.pdf
    • http://aessentia.com/images/coin-master-hack-iphone_GM406889139.pdf
    • http://aessentia.com/images/how-to-get-free-robux-on-computer_GM431946152.pdf
    • http://aessentia.com/images/free-roblox-hair-girl_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000045ee.bin
000555f17ed02aac1f29119eb5a20c5cf2a0a4e74c3810bfe5967a91a1533894		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45EE 25700 bytes
font_01_sfnt_off00008177.bin
0988d84c654cad7fd64df8ed03d3555b2dfd5e63404faa7131ff859ccef1ee1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8177 18488 bytes

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