Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5b6b7e70b2cf10…

MALICIOUS

PDF

45.0 KB Created: 2021-05-17 05:20:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e3e0da24bfa48a006a1aec1eef43ae4d SHA-1: a2a98744c26965854269be28a2921c71f23a2cab SHA-256: 5b5b6b7e70b2cf1000761b87d40f4f653431d6df64776156ad21c8ee4de4a394
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded external links, many of which point to SEO-spam-like content related to game cheats and free accounts. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, and the ML classifier strongly suggests maliciousness. The document body and embedded links suggest a lure to external sites, likely for SEO spam or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/406889139/coin-master-links-to-get-free-spins-game-hack
    • http://immo360grad.com/images/free-robux-accounts-2021_GM431946152.pdf
    • http://immo360grad.com/images/minecraft-mobile-free_GM479516143.pdf
    • http://immo360grad.com/images/how-to-get-a-free-dominus-in-roblox_GM431946152.pdf
    • http://immo360grad.com/images/coin-master-hack-pro-gamers_GM406889139.pdf
    • http://immo360grad.com/images/how-do-u-hack-roblox_GM431946152.pdf
    • http://immo360grad.com/images/how-to-get-free-robux-on-phone_GM431946152.pdf
    • http://immo360grad.com/images/get-free-robux_GM431946152.pdf
    • http://immo360grad.com/images/free-roblox-accounts-that-work_GM431946152.pdf
    • http://immo360grad.com/images/how-to-get-free-robux-on-ipad_GM431946152.pdf
    • http://immo360grad.com/images/pig-master-coin-master-free-spin_GM406889139.pdf
    • http://immo360grad.com/images/free-robux-discord_GM431946152.pdf
    • http://immo360grad.com/images/how-to-get-free-roblox_GM431946152.pdf
    • http://immo360grad.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://immo360grad.com/images/wwwcoin-master-hack-game-download_GM406889139.pdf
    • http://immo360grad.com/images/oprewards-com-roblox_GM431946152.pdf
    • http://immo360grad.com/images/best-way-to-get-free-robux_GM431946152.pdf
    • http://immo360grad.com/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://immo360grad.com/images/i-need-more-free-spins-on-coin-master_GM406889139.pdf
    • http://immo360grad.com/images/free-robux-without-downloading-apps_GM431946152.pdf
    • http://immo360grad.com/images/is-minecraft-java-edition-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b6a.bin
91a7ad21e899a1113f9431cc942f1db3321e7009bc3d1d47599d024304b99fa7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B6A 24468 bytes
font_01_sfnt_off000083bb.bin
fcfcd28869b8d6c7503d63ed8d48371ec5b580fea2733193e2acbb82b3d30a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83BB 2944 bytes
font_02_sfnt_off00008de6.bin
d6f48365c8184d813f3f97722928ecdf71d9bd5c6eacb29ace11fc0c34dd539a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE6 18056 bytes

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