Malicious PDF — malware analysis report

Static analysis result for SHA-256 d699f8a4447a4a17…

MALICIOUS

PDF

42.7 KB Created: 2021-05-14 10:35:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3e15e6ff126c6c25c225f8e6ec41b0ae SHA-1: 78bf2983c052cd6a4515f2bbe3f27c5d6fdaaa0c SHA-256: d699f8a4447a4a17c9bac54f7f0026e5888460f0eb83005f9b7c8195c6bc2c7f
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 interacting with embedded links. The document contains a large number of external links, many of which point to PDF files with SEO-like slugs, suggesting a link farm or content-spinning operation. The primary URL, https://netcdn.xyz/app/431946152/can-i-get-free-robux-game-hack, is likely the intended destination for users who fall for the CAPTCHA lure.

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/can-i-get-free-robux-game-hack
    • http://www.gravel.ru/images/free-pet-food-coin-master_GM406889139.pdf
    • http://www.gravel.ru/images/free-robux-with-no-survey_GM431946152.pdf
    • http://www.gravel.ru/images/how-to-get-free-robux-gift-cards_GM431946152.pdf
    • http://www.gravel.ru/images/free-robux-roblox-promo-codes_GM431946152.pdf
    • http://www.gravel.ru/images/free-roblox-usernames-and-passwords_GM431946152.pdf
    • http://www.gravel.ru/images/earn-roblox_GM431946152.pdf
    • http://www.gravel.ru/images/how-to-get-free-robux-generator_GM431946152.pdf
    • http://www.gravel.ru/images/easy-way-to-get-robux_GM431946152.pdf
    • http://www.gravel.ru/images/free-robux-scam_GM431946152.pdf
    • http://www.gravel.ru/images/free-robux-no-generator_GM431946152.pdf
    • http://www.gravel.ru/images/coin-master-spins-2021_GM406889139.pdf
    • http://www.gravel.ru/images/coin-master-free-stuff_GM406889139.pdf
    • http://www.gravel.ru/images/how-to-get-free-robux-website_GM431946152.pdf
    • http://www.gravel.ru/images/coin-master-free-spins-link-download-today_GM406889139.pdf
    • http://www.gravel.ru/images/free-gold-cards-for-coin-master_GM406889139.pdf
    • http://www.gravel.ru/images/roblox-hack-me_GM431946152.pdf
    • http://www.gravel.ru/images/coin-master-free-2021-spin-link-today_GM406889139.pdf
    • http://www.gravel.ru/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • http://www.gravel.ru/images/free-coins-coin-master-iphone_GM406889139.pdf
    • http://www.gravel.ru/images/free-robux-on-iphone_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000498f.bin
38fadd02728b5f3fe70bd60d01022528feb4ab89bae00d4e8246b49ae5b25939
pdf-font-stream PDF embedded font (sfnt) at offset 0x498F 26048 bytes
font_01_sfnt_off00008431.bin
a3821bea5d8002917ca36036ff520c3c0be187df4be91a81bd8356ddd2b369c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8431 18344 bytes