Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7888c21157ad14…

MALICIOUS

PDF

35.4 KB Created: 2021-06-17 18:56:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 200ffbd5729c87c34e9420902c7e8a7e SHA-1: 75b0f14021a3eb96383cc7167f863e9dc00ba36f SHA-256: 2a7888c21157ad140bd054f78cea6e0535cd293ba847a49e44594193cb515f3a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to files related to game cheats and hacks, such as 'free Robux'. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading potentially harmful content. The document's structure and content suggest it is part of a link farm designed to distribute malware or lead users to phishing 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.co/app/431946152/free-robux-codes-2021-not-used-game-hack
    • http://iba.org.fj/wp-content/uploads/fsqm-files/roblox-comment-hacker_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/how-to-hack-digimon-aurity-roblox_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/how-to-get-free-robux-on-ipad-2021-easy_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/how-to-get-roblox-tickets-hack_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/roblox-com-mobile-hacks-for-free_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/free-robux-2021-real_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/coin-master-free-spins-today-daily-links_GM406889139.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/roblox-analytics-hack_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/gladiator-simulator-roblox-hacks_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/how-to-get-free-robux-credit-card-generator_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/cheat-engine-roblox-hack-download-free_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/get-free-robux-no-human-verification_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/how-to-get-robux-for-free-on-a-comuter_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/roblox-studio-how-to-make-a-free-robux-game_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/free-robux-inspect-element_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/unlimited-gaming-hacks-roblox-generator_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/roblox-free-robux-gift-card-codes-2021_GM431946152.pdf
    • http://iba.org.fj/wp-content/uploads/fsqm-files/how-to-get-free-robux-no-download-no-survey-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000320c.bin
752316fee5396902b8b01d2fa8b8c5da2a34f5a0e195f5a74d20066aff67c1ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x320C 22388 bytes
font_01_sfnt_off0000643d.bin
25d7bfe460846437b60ba32f00233ff0583bbe4639522c561b722c1edc24abf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x643D 19396 bytes

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