Malicious PDF — malware analysis report

Static analysis result for SHA-256 3363ba140a6cefa0…

MALICIOUS

PDF

43.2 KB Created: 2021-05-14 09:07:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3ace03fa6d9aabd7850be5c02eae0052 SHA-1: e58eaa07f7acae86e6fb9317590b72880cad1084 SHA-256: 3363ba140a6cefa08eaebf59d6b7f4e096f9a2565be6bf877530a0d1232202d5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a fake CAPTCHA lure, indicating a likely attempt to trick users into visiting malicious websites or downloading further payloads. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests a SEO-based distribution method. No scripts were extracted, but the document body and heuristics point towards a scam or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/robuxfree-con-game-hack
    • http://gamixpaliwa.pl/images/mcpe-master-hack-unlimited-coins-download_GM406889139.pdf
    • http://gamixpaliwa.pl/images/roblox-free-online-game_GM431946152.pdf
    • http://gamixpaliwa.pl/images/roblox-hack-generator_GM431946152.pdf
    • http://gamixpaliwa.pl/images/kuso-icu-roblox-hack_GM431946152.pdf
    • http://gamixpaliwa.pl/images/open-coin-master_GM406889139.pdf
    • http://gamixpaliwa.pl/images/free-robux-no-verification-no-download-2021_GM431946152.pdf
    • http://gamixpaliwa.pl/images/coin-master-hack-no-verification-ios_GM406889139.pdf
    • http://gamixpaliwa.pl/images/how-can-i-get-free-coinsn-coin-master_GM406889139.pdf
    • http://gamixpaliwa.pl/images/daily-free-spins-coin-master-2021_GM406889139.pdf
    • http://gamixpaliwa.pl/images/how-do-u-get-free-robux_GM431946152.pdf
    • http://gamixpaliwa.pl/images/free-online-spins-coin-master_GM406889139.pdf
    • http://gamixpaliwa.pl/images/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • http://gamixpaliwa.pl/images/coin-master-free-2021-spin-link_GM406889139.pdf
    • http://gamixpaliwa.pl/images/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdf
    • http://gamixpaliwa.pl/images/coin-master-hack-ios-app_GM406889139.pdf
    • http://gamixpaliwa.pl/images/codes-to-get-free-robux_GM431946152.pdf
    • http://gamixpaliwa.pl/images/toolbox-apk_GM479516143.pdf
    • http://gamixpaliwa.pl/images/minecraft-alt-accounts-free_GM479516143.pdf
    • http://gamixpaliwa.pl/images/websites-that-give-you-free-robux_GM431946152.pdf
    • http://gamixpaliwa.pl/images/can-you-host-a-minecraft-server-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c4a.bin
4099a15bce7a69bedabf6e05917b699f8e6ab852d8ca74cae602bd27001b47ad
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C4A 25488 bytes
font_01_sfnt_off000087d5.bin
2abfd2a7a9970b37389a870ca2f729fd01b6f1f075e52c5d41a045b4308c3fdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x87D5 17852 bytes