Malicious PDF — malware analysis report

Static analysis result for SHA-256 8654967feefba47a…

MALICIOUS

PDF

44.0 KB Created: 2021-06-09 16:59:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d5d12ade804e750ba5a12b41cb0fb61d SHA-1: c89b0e3842b3a60e32a09ce78af9cad751bdb219 SHA-256: 8654967feefba47a56c343fb38742eeb922bc56820c6af793b3da12fb2f87fb3
182 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA and a 'free Robux' lure to trick users into clicking embedded links, which likely lead to malicious websites or downloads. The presence of numerous external links suggests a link farm designed to distribute malware or phishing content. While no scripts were explicitly extracted, the PDF structure and heuristics indicate a malicious intent to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-robux-net-game-hack
    • http://lc.pustaka.unand.ac.id/repository/free-robux-no-apps_GM431946152.pdf
    • http://lc.pustaka.unand.ac.id/repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdf
    • http://lc.pustaka.unand.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/coin-master-free-daily-spins-2021_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/how-to-hack-roblox-and-get-infinite-health-2021_GM431946152.pdf
    • http://lc.pustaka.unand.ac.id/repository/how-to-earn-free-robux_GM431946152.pdf
    • http://lc.pustaka.unand.ac.id/repository/hack-coin-master-apk-33_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/coin-master-2021-free-spins-link_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/www-roblox-robux_GM431946152.pdf
    • http://lc.pustaka.unand.ac.id/repository/game-coin-master-hack_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/free-spins-on-coin-master-2021-ios_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/coin-master-hack-ios-jailbreak_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/hack-coin-master-app_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/is-minecraft-java-edition-free_GM479516143.pdf
    • http://lc.pustaka.unand.ac.id/repository/how-to-get-free-snacks-in-coin-master_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/ww-robux_GM431946152.pdf
    • http://lc.pustaka.unand.ac.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdf
    • http://lc.pustaka.unand.ac.id/repository/cheat-monkey-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000532d.bin
393abe221899c00b22b91919b038d2c5b1be91b6a0e54e1f43d71808b7165be3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x532D 23992 bytes
font_01_sfnt_off0000899d.bin
1fd200dee0908774cd7421e0a60456d96d7b5616485fa29449c155c3981f88c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x899D 18120 bytes

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