Malicious PDF — malware analysis report

Static analysis result for SHA-256 988905c03bcb61b7…

MALICIOUS

PDF

41.4 KB Created: 2021-05-17 00:35:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a750dc43381528944764a92c3dc05c02 SHA-1: 99e6b0a166c70e6b5507718e441edc95f6aa2fa6 SHA-256: 988905c03bcb61b7186feef6d291fb1bb242c60db25b5ddac6b916beb1fbb70a
142 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious lure, employing a fake CAPTCHA to trick users into clicking embedded links. The document contains a large number of external links, many of which point to other PDFs hosted on similar domains, suggesting a link farm or redirection scheme. The primary URL, https://netcdn.xyz/app/431946152/get-more-robux-game-hack, is likely the initial download or redirection point for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/get-more-robux-game-hack
    • https://mountainholidaytreks.com/userfiles/files/hack-xp-net-coin-master_GM406889139.pdf
    • https://mountainholidaytreks.com/userfiles/files/minecraft-xbox-free_GM479516143.pdf
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • https://mountainholidaytreks.com/userfiles/files/how-to-download-minecraft-for-free-on-windows_GM479516143.pdf
    • https://mountainholidaytreks.com/userfiles/files/free-coins-spins-on-coin-master_GM406889139.pdf
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdf
    • https://mountainholidaytreks.com/userfiles/files/minecraft-fly-hack_GM479516143.pdf
    • https://mountainholidaytreks.com/userfiles/files/codes-how-to-get-free-robux_GM431946152.pdf
    • https://mountainholidaytreks.com/userfiles/files/robux-hack-no-human-verification_GM431946152.pdf
    • https://mountainholidaytreks.com/userfiles/files/roblox-robux-hack-generator_GM431946152.pdf
    • https://mountainholidaytreks.com/userfiles/files/free-spin-link-for-coin-master_GM406889139.pdf
    • https://mountainholidaytreks.com/userfiles/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdf
    • https://mountainholidaytreks.com/userfiles/files/coin-master-32-mod-hack-unlimited_GM406889139.pdf
    • https://mountainholidaytreks.com/userfiles/files/how-do-u-hack-roblox_GM431946152.pdf
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • https://mountainholidaytreks.com/userfiles/files/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • https://mountainholidaytreks.com/userfiles/files/login-robux_GM431946152.pdf
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • https://mountainholidaytreks.com/userfiles/files/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdf
    • https://mountainholidaytreks.com/userfiles/files/free-robux-site_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004899.bin
e5384adaa00d75b3ca28c7736027786eeda50df42f507e3e30edcaefd1efc2ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4899 24476 bytes
font_01_sfnt_off00007f88.bin
3f0afb5031a6524980f5b4f14d61315d560e84a079a8a334c40e6e2be07f7597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F88 18152 bytes

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