Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb90a6d20891561…

MALICIOUS

PDF

48.7 KB Created: 2021-06-09 04:52:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c157ef88ecf7f19e8a5f817960bc9768 SHA-1: c1271c70aa6fb5759dfc0be15cab33f5af129249 SHA-256: 2fb90a6d20891561fd8606941d5ca22335aad7f70c2ce0ac784e67e0fb2bdebd
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links to external websites, many of which appear to be part of a link farm designed to attract users searching for free in-game currency or accounts. The ML classifier strongly flagged this PDF as malicious, and the presence of a visual download button further supports a deceptive intent. The primary attack pattern involves luring users to potentially malicious sites through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 4

  • 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.
  • 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/como-tener-robux-gratis-sin-hack-ni-admin-game-hack
    • http://simon-skov-fougt.dk/billeder/coinmaster-rewards_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/free-spins-on-coin-master-generator_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/wurst-18_GM479516143.pdf
    • http://simon-skov-fougt.dk/billeder/free-roblox-accounts-v3rmillion_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/free-daily-spins-from-coin-master_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/coin-master-ios-gods-hack_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/coin-master-free-spin-redeem-code_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/coin-master-free-spins-hack-apk-download_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/redboy-v2-jailbreak-hack-roblox_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/free-game-packs-for-coin-master_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/free-spin-link-for-coin-master_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/links-to-get-free-coins-in-coin-master_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/how-to-get-free-pokemon-go-accounts_GM1094591345.pdf
    • http://simon-skov-fougt.dk/billeder/coin-master-heaven-free-spins-today_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/cheats-for-coin-master_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/free-roblox-com_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/coin-master-hack-no-root_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ac5.bin
3b6dc09bb31044653923ddf058d70fef6a60f74728c92f39d4147cc06909911c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC5 27536 bytes
font_01_sfnt_off00009a35.bin
5263a13b94a1d0a73f60c1101ce659038aa7fc96261ecad05b167615a645e798
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A35 18908 bytes