Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42636b1418f5174…

MALICIOUS

PDF

35.6 KB Created: 2021-07-05 18:04:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3798c4aaebb62ac4145522a75bec7834 SHA-1: 67fe596f86bc7eedb59aa219a66cf804a2431683 SHA-256: b42636b1418f51742ede3fb7fb65331e4064db92978ef7e7b15ad797a8127a21
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs and a 'link farm' structure, strongly suggesting it is designed to redirect users to malicious websites. The document body and extracted URLs explicitly mention 'Unlimited Robux', 'hacks', and 'free spins', indicating a lure for potentially unwanted or malicious downloads. The ML classifier also flagged this PDF with high confidence.

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/unlimited-robux-game-hack
    • http://elib.upiyptk.ac.id/opac/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-spins-link-today-ios_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac/repository/destruction-simulator-roblox-hack_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/how-to-look-like-a-pro-in-roblox-for-free_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-free-apk_GM479516143.pdf
    • http://elib.upiyptk.ac.id/opac//repository/how-to-get-free-coins-in-coin-master_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-robux-app_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-links-for-free-spins_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac/repository/how-to-not-get-kicked-for-hacking-in-roblox_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac//repository/how-to-get-free-robux-games_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-java-edition-free_GM479516143.pdf
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-spins-link-download-apk_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-spins-link-today-haktuts_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-32-android-mod-hack-apk-download_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac//repository/hackear-coin-master-espaol_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac//repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdf
    • http://elib.upiyptk.ac.id/opac/repository/www-free-robux_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/roblox-zone-free-robux_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/como-tener-dinero-infinito-en-jailbreak-roblox-hack-2021_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-spins-link-download-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030a5.bin
153823f9f7318f929ce891ae34219724dc281ff1ce28344205baf7fd4fbfafda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30A5 23380 bytes
font_01_sfnt_off00006564.bin
facb7e578a1cab29536950ca6e6e4768181c4020f33da1e6d8c95277e0885859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6564 19284 bytes

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