Malicious PDF — malware analysis report

Static analysis result for SHA-256 712bcb567d21bd2a…

MALICIOUS

PDF

45.9 KB Created: 2021-06-10 16:40:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 18f4d7a7ebf23f4abc2cc7d6dabc897e SHA-1: 0972a84747e9a9cb034a0abf1be95329fe3e162f SHA-256: 712bcb567d21bd2aa7161fdd96043d469b30bfca32ec4b1f2a24954d27fab768
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, likely to initiate a download. The embedded URL, https://netcdn.tw/app/431946152/free-noclip-hack-for-roblox-game-hack, is a strong indicator of a malicious download attempt. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit user interaction for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/free-noclip-hack-for-roblox-game-hack
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/free-minecraft-resource-packs_GM479516143.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/descargar-hack-deathrun-roblox_GM431946152.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/free-minecraft-alts_GM479516143.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/roblox-elemental-battleground-hack-script_GM431946152.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/free-stuff-on-roblox-on-computer_GM431946152.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/free-robux-claim_GM431946152.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/coin-master-free-spins-link_GM406889139.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/how-to-get-free-robux-on-kindle-fire_GM431946152.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/citizen-roblox-hacking_GM431946152.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/robux-hack-no-verification-needed_GM431946152.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/download-synapse-roblox-hack-free_GM431946152.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/free-shirts-on-roblox-2021_GM431946152.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/how-to-get-free-items-roblox_GM431946152.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/roblox-limiteds-for-free_GM431946152.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/hacks-para-roblox-android_GM431946152.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/roblox-penguin-package-free_GM431946152.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/how-to-look-like-a-hacker-in-roblox-for-free_GM431946152.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/best-roblox-free-skins_GM431946152.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/where-to-find-roblox-hacks_GM431946152.pdf
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/roblox-sand-simulator-hack-android_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005495.bin
96571eaad90c65b02e6eebb40776cae99a47dfca136fc3874a7f3f2dde017b2d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5495 25864 bytes
font_01_sfnt_off00008ff2.bin
7e34c8735789f7b8fd9025219aeadebb4119e4bf761cdaa7448f57743f95ed35
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF2 18640 bytes