Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b6796974621056…

MALICIOUS

PDF

46.5 KB Created: 2021-06-09 05:23:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 591a1732b9d581fefe960f37f7e28515 SHA-1: 511ecd9bef09117932567fc06a7c5ecd8f76678f SHA-256: 86b6796974621056a8d5fd2f5f98271aac62a9dc9482f0d6e813d42cd84df869
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, aiming to trick users into downloading a malicious file. It embeds numerous links to external PDF files, many of which appear to be SEO-optimized for game hacks and cheats, suggesting a link farm designed to distribute malware. The primary URL, https://netcdn.tw/app/431946152/roblox-jailbreak-lamborghini-hack-game-hack, is likely the distribution point for the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/roblox-jailbreak-lamborghini-hack-game-hack PDF link annotation
    • http://digilib-pps.unja.ac.id/repository/robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/best-free-roblox-survival-games_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-accounts-with-robux-2021-june_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000055f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55F4 25676 bytes
SHA-256: 322164af169917629204509ae8f42770df44ec5ceff3c7d8fa0e0e56ad3e065c
font_01_sfnt_off000090f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90F7 19180 bytes
SHA-256: 33bd301be98574928c6a6538b69286320d28d245090b4981340004605b7ecf0f

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