Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8ee69a1ac56d8f…

MALICIOUS

PDF

41.2 KB Created: 2021-05-10 20:36:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2d43b0b912b05ecec190620cc966d82c SHA-1: e62cc6456dbc0db034584299046d46462f40648b SHA-256: ef8ee69a1ac56d8f96102e7dc62e7dcebe40e15ed610d4751eac99ecbfc21adb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, many of which point to external resources related to game cheats and free items, suggesting a lure for users to download potentially malicious content. The presence of a 'password-protected archive handoff' heuristic indicates a common tactic to bypass security scanning. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/freecoins-game-hack
    • http://library.asih-husada.ac.id/repository/how-do-i-get-free-robux_GM431946152.pdf
    • http://library.asih-husada.ac.id/repository/coin-master-free-spins-cheat-codes_GM406889139.pdf
    • http://library.asih-husada.ac.id/repository/how-to-get-more-robux-for-free_GM431946152.pdf
    • http://library.asih-husada.ac.id/repository/how-to-hack-coin-master-without-root_GM406889139.pdf
    • http://library.asih-husada.ac.id/repository/minecraft-world-free-download_GM479516143.pdf
    • http://library.asih-husada.ac.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdf
    • http://library.asih-husada.ac.id/repository/free-coin-master-gifts_GM406889139.pdf
    • http://library.asih-husada.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdf
    • http://library.asih-husada.ac.id/repository/free-minecraft-account-and-password-2021_GM479516143.pdf
    • http://library.asih-husada.ac.id/repository/www-coin-master-hack_GM406889139.pdf
    • http://library.asih-husada.ac.id/repository/free-robux-clothes_GM431946152.pdf
    • http://library.asih-husada.ac.id/repository/minecraft-server-hacks_GM479516143.pdf
    • http://library.asih-husada.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdf
    • http://library.asih-husada.ac.id/repository/coin-master-free-download-app_GM406889139.pdf
    • http://library.asih-husada.ac.id/repository/minecraft-the-complete-handbook-collection_GM479516143.pdf
    • http://library.asih-husada.ac.id/repository/toolbox-apk_GM479516143.pdf
    • http://library.asih-husada.ac.id/repository/100-free-spins-for-coin-master_GM406889139.pdf
    • http://library.asih-husada.ac.id/repository/free-robux-now_GM431946152.pdf
    • http://library.asih-husada.ac.id/repository/robux-in_GM431946152.pdf
    • http://library.asih-husada.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004893.bin
91882da29b98a9f393a2d1636fd58202f2263ad772007d8878c67155831bd2fc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4893 24820 bytes
font_01_sfnt_off00008183.bin
b7451c9dd0ac59d2b5cb55b76db2f7cf076c87adc9efeb70e2d733c8c551e0a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8183 17380 bytes

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