Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf3d8ffd6369003…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 12:35:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 50c19b95f21a5fa739f7bfb73f6497d9 SHA-1: 4655f85d8540214466b532c360fd96c5e1ab03c4 SHA-256: ccf3d8ffd636900352679b8e04b5780e0a89de5df0c3055fa6448e60e7b8c384
102 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs and a specific URL pointing to 'earnrobux-game-hack', suggesting a lure for game-related exploits or scams. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are also PDFs, further supporting the idea of a link farm designed to attract users. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic reinforces the deceptive nature of the document.

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/earnrobux-game-hack
    • https://jdclassicautoparts.com/image/data/files/free-spins-coin-master-hack_GM406889139.pdf
    • https://jdclassicautoparts.com/image/data/files/7aykw-duncan-free-robux-no-survey-human-verification_GM431946152.pdf
    • https://jdclassicautoparts.com/image/data/files/free-robux-that-actually-works-2021_GM431946152.pdf
    • https://jdclassicautoparts.com/image/data/files/free-realistic-minecraft-texture-packs_GM479516143.pdf
    • https://jdclassicautoparts.com/image/data/files/how-to-inspect-and-get-free-robux_GM431946152.pdf
    • https://jdclassicautoparts.com/image/data/files/minecraft-aimbot_GM479516143.pdf
    • https://jdclassicautoparts.com/image/data/files/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • https://jdclassicautoparts.com/image/data/files/tiktok-minecraft-hacks_GM479516143.pdf
    • https://jdclassicautoparts.com/image/data/files/minecraft-free-no-download_GM479516143.pdf
    • https://jdclassicautoparts.com/image/data/files/plug-toolbox-for-minecraft-free-ios_GM479516143.pdf
    • https://jdclassicautoparts.com/image/data/files/free-coin-master-links_GM406889139.pdf
    • https://jdclassicautoparts.com/image/data/files/coin-master-400-spin-link-hack_GM406889139.pdf
    • https://jdclassicautoparts.com/image/data/files/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdf
    • https://jdclassicautoparts.com/image/data/files/how-to-get-free-robux-by-playing-games_GM431946152.pdf
    • https://jdclassicautoparts.com/image/data/files/pokemon-go-free-to-play_GM1094591345.pdf
    • https://jdclassicautoparts.com/image/data/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdf
    • https://jdclassicautoparts.com/image/data/files/minecraft-book-collection_GM479516143.pdf
    • https://jdclassicautoparts.com/image/data/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdf
    • https://jdclassicautoparts.com/image/data/files/roblox-dinosaur-simulator-cheat-engine-dna_GM431946152.pdf
    • https://jdclassicautoparts.com/image/data/files/mobihack-net-roblox-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000313a.bin
1a0ff40174d887e7b036ab38732432bb93446dee5189cd835f74bf2d0290f0da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x313A 22268 bytes
font_01_sfnt_off0000630d.bin
6794fc7ee49cdd0a33f98bbbc8a763353555002210e507bd98e2a39f67d6f290		 pdf-font-stream PDF embedded font (sfnt) at offset 0x630D 18552 bytes

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