Malicious PDF — malware analysis report

Static analysis result for SHA-256 5620886e3fba8e46…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 08:04:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7058424908da7169085b87add36fc840 SHA-1: efde4c3d0fff21d5e8bb05e9e4606bfeb54c3132 SHA-256: 5620886e3fba8e46d22cd027f0149b7463fb73baae03ed247392135323bbd124
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs and a "download button" lure, strongly suggesting it is designed to trick users into downloading malicious files. The ML classifier and PDF link farm heuristics indicate a high likelihood of malicious intent, likely related to distributing malware or engaging in phishing for game-related accounts. The primary URL http://netcdn.tw/app/431946152/hack-avatar-game-hack is a key indicator of the payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/hack-avatar-game-hack
    • http://lib.uho.ac.id/library/repository/how-to-make-clothes-free-on-roblox_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/free-robux-thumbnail_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-2021_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-website_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-hack-download_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-gold-cards-free-2021_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/roblox-hack-free-no-human-verification_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/master-free-spin-and-coin-links-html-m-1_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-coins_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-gift-cards_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-hack-without-verification-ios_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/how-to-hack-roblox-account-on-chromebook_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/roblox-promo-codes-free-robux_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/pubg-uc-online-free_GM1330123889.pdf
    • http://lib.uho.ac.id/library/repository/how-to-get-more-robux-for-free_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/robux-hack-generator_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/free-items-with-roblox-card-walmart_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/how-to-install-minecraft-for-free-on-ios_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f50.bin
a2f58ab92c2bacc79c70e1834160037468bbaefa2736d8ecf3b54ad630b98176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F50 22468 bytes
font_01_sfnt_off00006152.bin
15fe832cb1a67f8b9b32bd16fa6b944b1b609e54d644db6923f8635996eddc7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6152 18292 bytes

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