Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8d039d2d31f56a…

MALICIOUS

PDF

45.9 KB Created: 2021-05-12 05:03:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7f78014f66956038138da95abe3186e7 SHA-1: bd226ceed2803b28f5aee189c08b51cdb888b6e1 SHA-256: 1a8d039d2d31f56aec6f8cca8304df3a9706544523223620d452bc9791d2896b
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, specifically a fake CAPTCHA or human verification prompt, designed to trick users into clicking malicious links. The document contains numerous embedded URLs, including one pointing to 'netcdn.xyz', which likely serve as redirects to scam websites or download further malicious content. The presence of a PDF_SEO_LINK_FARM heuristic further indicates a large number of external links, suggesting a broad distribution effort for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/robux-hack-me-game-hack
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-email-rewards-link_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-fan-page-facebook_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-hack-for-android_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-robux-no-survey-or-human-verification_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-20-free-spins-link-2021_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-robux-generator-without-human-verification_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/spin-and-coin-link_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/mcpe-master-coins-hack_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/roblox-robux-generator-no-human-verification_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-robux-hacks-no-verification_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/500-free-spins-coin-master_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-free-spins-link-today-2021_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-hack-for-ios_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/hacks-for-coin-master-game_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/funbloxxyz-free-robux_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-heaven-links_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048c5.bin
d6cdaf16ac0b583b75d0569b2c28b9e7dd5f470d22169af4c8abe6c7e3063cfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48C5 25976 bytes
font_01_sfnt_off00008355.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8355 5696 bytes
font_02_sfnt_off00009066.bin
63c17dbc7d8c7d1de0ff2471750372836806f4a6a54ec4612fcacbe2caf81c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9066 18444 bytes

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