Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afd8a66880d7291…

MALICIOUS

PDF

46.1 KB Created: 2021-06-01 16:40:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bbcac9323b86699ddd0e802be2fd8ceb SHA-1: d2313c0c301286a845c985ea417067ff86c32f6b SHA-256: 6afd8a66880d7291f0b5294073e23a80840d5ae8a3eb0bfaf3cc6be1756a999c
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into clicking links, which is a common social engineering tactic. The document also contains numerous external links, many of which point to other PDFs, suggesting a link farm designed to distribute malicious content or redirect users to exploit kits. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/codes-free-robux-on-blox.land-youtube-game-hack
    • http://iba.org.fj/wp-content/uploads/fsqm-files/roblox-com-mobile-hacks-for-free_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/rblx-gg-earn-free-robux_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/como-tener-dinero-infinito-roblox-high-school-hack_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/roblox-passwort-hacken_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/roblox-mobile-cheat_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/free-robux-2021_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/how-to-get-hacks-on-roblox_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/how-to-get-free-robux-credit-card-generator_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/roblox-dynamic-ship-simulator-hack_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/free-promo-codes-for-robux_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/get-free-robux-no-human-verification_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/roblox-free-items-promo-codes_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/tiktok-viewer-free_GM835599320.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/coin-master-hack_GM406889139.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/can-i-get-minecraft-for-free_GM479516143.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/how-to-get-free-skins-in-minecraft_GM479516143.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/free-robux-generator-pro_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/join-this-roblox-group-for-free-robux-roblox-groups_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005367.bin
e7f2365d21c7c47f242625ec28212c9232edef0a5f3d226ef17f45e5736d965f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5367 26276 bytes
font_01_sfnt_off00009025.bin
786c6f8527d633f0b6b2c5fe387977fc31a2a56ca97ace34457289e283e772ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9025 18820 bytes

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