Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d9eb63f8392814…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 11:56:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 773e1b4e783ad66f955bf673b36844f2 SHA-1: a13d05fb74043994caa64511a2d60a017bda2a29 SHA-256: e7d9eb63f839281401150cbf51ef8571d88c27468ee4cd5b3b6f4d5cd8e09f57
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to external websites, many of which are structured as SEO-optimized PDF gateways for free in-game items and currency. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic further supports a lure-based attack. The primary goal appears to be directing users to potentially malicious sites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/robux-free-2021-game-hack
    • https://ifef.es/ckfinder/userfiles/files/free-modded-minecraft-server-hosting_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-cards-hack_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/i-need-more-free-spins-on-coin-master_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-robux-generator-without-verification_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/what-is-a-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/minecraft-com-free_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/pubg-uc-and-skins-smm-panel_GM1330123889.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-hack-safe_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/synapse-roblox-free_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/script-executor-roblox-free_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/robux-generator-com_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-spin-links-coin-master-2021_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-fun-hack_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/hacked-roblox-game_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005280.bin
c189c5771aa58bc74f1a48968bae8ac84930455eccdf2715c9e556f0d3712a69
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5280 24908 bytes
font_01_sfnt_off00008bf5.bin
1a644f5289783458eb76ac5741ebd0afe9ba6d8f40911ca8ddb4573f3c6c1b2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF5 18416 bytes