Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfbe00a93abe08f…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 13:03:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 01325ac89a6d127ca2726d1dd58caa8d SHA-1: 1ddb1db506cf065eb0d0ac17a2a9ee816b854e18 SHA-256: cdfbe00a93abe08fca794def6506124f0a8f70479f15a6beae0d95a65131b74d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains numerous links to external websites, many of which are SEO-optimized PDF files, suggesting a link farm designed to attract users searching for free in-game items. The presence of a 'download button' lure and instructions for password-protected archives indicates a likely attempt to trick users into downloading malware. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/free-robux-hack-2021-game-hack
    • http://library.thamrin.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/free-robux-generator-2021-no-survey_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/roblox-free-robux-no-verification_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdf
    • http://library.thamrin.ac.id/repository/app-for-free-spins-on-coin-master_GM406889139.pdf
    • http://library.thamrin.ac.id/repository/how-to-get-800-robux-for-free_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/spin-free-coin-master_GM406889139.pdf
    • http://library.thamrin.ac.id/repository/free-robux-promo-codes_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/free-minecraft-account-and-password-generator_GM479516143.pdf
    • http://library.thamrin.ac.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/minecraft-apk-android-free_GM479516143.pdf
    • http://library.thamrin.ac.id/repository/fighting-free-card-coin-master_GM406889139.pdf
    • http://library.thamrin.ac.id/repository/robux-place-rewards_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/bloxpink-free-robux_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdf
    • http://library.thamrin.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://library.thamrin.ac.id/repository/coin-master-free-spins-app_GM406889139.pdf
    • http://library.thamrin.ac.id/repository/info-roblox-com-robux_GM431946152.pdf
    • http://library.thamrin.ac.id/repository/coin-master-free-cards-link_GM406889139.pdf
    • http://library.thamrin.ac.id/repository/roblox-online-free-no-download_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f4c.bin
7737328296915adaa2795306de468ffb9230428e7fcb38148706006b0601b010		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F4C 22408 bytes
font_01_sfnt_off0000616e.bin
f0e75447e64b5aff6e0a409bd439ae7070421d1013f4950abf0614a44f9f6dfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616E 19288 bytes

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