Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b69558a77343bf…

MALICIOUS

PDF

35.2 KB Created: 2021-07-09 12:10:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1cd8a424c2d280d2eae26313211a3c64 SHA-1: acc5457457cc67988b2e5340f72571bdc5601c6c SHA-256: 44b69558a77343bf734fef3de1bb7ea4a72e36c0675173b69cf1faf32eca1061
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external resources, many of which are SEO-optimized PDF files hosted on a subdomain of a school website, likely as a link farm. The primary external URL, http://netcdn.tw/app/431946152/www-free-robux-game-hack, suggests a lure for downloading potentially malicious content related to game hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button lure reinforces the malicious intent.

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/www-free-robux-game-hack
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/card-code-pw-free-roblox_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/youtube-roblox-how-to-get-free-obc_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/free-coins-for-flip-master-online_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/roblox-free-candy-van-hack_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/cm-daily-spins_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-ios_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-for-no-cost_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/peple-hacking-to-get-robux_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/can-u-get-free-robux_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/how-to-get-coin-master-free-spin-link_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/coin-master-hack-tool-generator_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/hacks-download-for-roblox-for-roblox_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/minecraft-free-online_GM479516143.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/hack-turkey-roblox_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/minecraft-skins-download-free_GM479516143.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-new_GM406889139.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/rbl-gg-free-robux_GM431946152.pdf
    • https://elearning.man2pontianak.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000323c.bin
c69c54d040c23ce7eedbdacd803dc31493339d8eca3ccbe3a81fae4e9d144cb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x323C 22488 bytes
font_01_sfnt_off00006495.bin
acf5ca21e1b57f7804790e88d3c8e797014eccbd964a564fa6b8ab1e1ef3ee82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6495 19080 bytes

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