Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2017798f928577e…

MALICIOUS

PDF

44.9 KB Created: 2021-06-09 11:29:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9e4932eee21a19a3e7a6dfa5e711a9bf SHA-1: dbc7d2781b0b6d641bc4b17bc0b995517bd287e7 SHA-256: e2017798f928577ef342aeb129c45f6c2198da9fcf35b76f7e80e56789f658f0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, presented as a lure for free game-related content, which is a common tactic for distributing malware. The heuristic PDF_SEO_LINK_FARM indicates a large number of these links, suggesting a link farm designed to attract users. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the file.

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.tw/app/431946152/free-roblox-script-executor-2021-game-hack
    • http://nebraskahospitalityhalloffame.com/images/free-robux-promo-codes-2021_GM431946152.pdf
    • http://nebraskahospitalityhalloffame.com/images/how-do-i-get-free-coins-on-coin-master_GM406889139.pdf
    • http://nebraskahospitalityhalloffame.com/images/roblox-hacking-weird_GM431946152.pdf
    • http://nebraskahospitalityhalloffame.com/images/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdf
    • http://nebraskahospitalityhalloffame.com/images/best-site-for-free-coin-master_GM406889139.pdf
    • http://nebraskahospitalityhalloffame.com/images/how-to-get-free-tiktok-fans_GM835599320.pdf
    • http://nebraskahospitalityhalloffame.com/images/coin-master-20-free-spins-link-2021_GM406889139.pdf
    • http://nebraskahospitalityhalloffame.com/images/free-robux-website_GM431946152.pdf
    • http://nebraskahospitalityhalloffame.com/images/minecraft-116-free_GM479516143.pdf
    • http://nebraskahospitalityhalloffame.com/images/roblox-generator_GM431946152.pdf
    • http://nebraskahospitalityhalloffame.com/images/coin-master-jackpot-hack_GM406889139.pdf
    • http://nebraskahospitalityhalloffame.com/images/pubg-uc-price-in-pakistan_GM1330123889.pdf
    • http://nebraskahospitalityhalloffame.com/images/free-card-link-coin-master_GM406889139.pdf
    • http://nebraskahospitalityhalloffame.com/images/roblox-jailbreak-hack_GM431946152.pdf
    • http://nebraskahospitalityhalloffame.com/images/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdf
    • http://nebraskahospitalityhalloffame.com/images/free-robux-generator-without-human-verification_GM431946152.pdf
    • http://nebraskahospitalityhalloffame.com/images/how-to-hack-roblox-accounts_GM431946152.pdf
    • http://nebraskahospitalityhalloffame.com/images/how-to-get-free-infinite-robux-in-roblox_GM431946152.pdf
    • http://nebraskahospitalityhalloffame.com/images/coin-master-free-spins-and-cards_GM406889139.pdf
    • http://nebraskahospitalityhalloffame.com/images/free-modded-minecraft-server-hosting_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000521f.bin
b6e5e59a6bb516897d323b753fb3c2a484b5c3c90fef6418ab052d4432541154		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x521F 25012 bytes
font_01_sfnt_off00008b1a.bin
9e0c0da612e7d51720d9660227da9b96250b956946eb4ee5d8869a1f0101ac5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1A 18892 bytes

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