Malicious PDF — malware analysis report

Static analysis result for SHA-256 641ae0ab5a0c570d…

MALICIOUS

PDF

33.5 KB Created: 2021-07-06 08:10:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cdc2479682b1f29b27d820760b95af11 SHA-1: 56386919f3a74ebcb448e39e52667a3e7cd7c778 SHA-256: 641ae0ab5a0c570dcdb438257d17c0cff7d3229936562545e7306c72db42da7f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, that lead to websites promising free in-game currency or game hacks. The ML classifier strongly indicated maliciousness, and the document body explicitly mentions 'Get More Robux' and includes URLs like 'http://netcdn.tw/app/431946152/get-more-robux-game-hack'. This suggests a phishing or scam attempt designed to redirect users to potentially malicious sites.

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/get-more-robux-game-hack
    • http://library.umla.ac.id//repository/is-minecraft-free-on-computer_GM479516143.pdf
    • http://library.umla.ac.id//repository/real-free-robux-generator_GM431946152.pdf
    • http://library.umla.ac.id//repository/get-free-gold-cards-in-coin-master_GM406889139.pdf
    • http://library.umla.ac.id/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdf
    • http://library.umla.ac.id//repository/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://library.umla.ac.id/repository/wurst-mc_GM479516143.pdf
    • http://library.umla.ac.id//repository/coin-master-free-spins-today-daily-links_GM406889139.pdf
    • http://library.umla.ac.id/repository/roblox-free-shirts-and-pants-for-girls_GM431946152.pdf
    • http://library.umla.ac.id/repository/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdf
    • http://library.umla.ac.id/repository/coin-master-connection-lost-hack_GM406889139.pdf
    • http://library.umla.ac.id/repository/hack-coin-master-for-iphone_GM406889139.pdf
    • http://library.umla.ac.id//repository/toolbox-premium-apk_GM479516143.pdf
    • http://library.umla.ac.id/repository/free-minecraft-website_GM479516143.pdf
    • http://library.umla.ac.id/repository/coin-master-free-spin-codes_GM406889139.pdf
    • http://library.umla.ac.id/repository/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdf
    • http://library.umla.ac.id//repository/rbx-gg-free-robux_GM431946152.pdf
    • http://library.umla.ac.id/repository/robux-get-com_GM431946152.pdf
    • http://library.umla.ac.id/repository/minecraft_GM479516143.pdf
    • http://library.umla.ac.id//repository/can-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://library.umla.ac.id/repository/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002c6b.bin
392f201b6bf0de57fa4fffc6db27578b2f4dbea8d1161409d2e36ef0492d3713		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2C6B 22312 bytes
font_01_sfnt_off00005e29.bin
b803333033a1d948a3e2070f5da6cc90ff41f413c00fb3b83224e61e6ba756dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E29 18852 bytes

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