Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd586c5d784df54…

MALICIOUS

PDF

49.1 KB Created: 2021-06-04 01:29:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f2f404e7c58a796b47e9a0729a7ecead SHA-1: d0c3b4016a45941e69a5e4964d222da5bf539155 SHA-256: 4dd586c5d784df54b9114c4e5866bb68e230a125927fd373e37b2f9aa1cc2688
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized links for game-related hacks and free currency. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. The document body, though partially garbled, contains a URL that aligns with the observed link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/431946152/is-there-any-way-to-get-free-robux-game-hack
    • http://opac.stiesa.ac.id/repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdf
    • http://opac.stiesa.ac.id/repository/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdf
    • http://opac.stiesa.ac.id/repository/how-to-hack-coin-master_GM406889139.pdf
    • http://opac.stiesa.ac.id/repository/universal-minecraft-converter-free_GM479516143.pdf
    • http://opac.stiesa.ac.id/repository/how-to-become-a-hacker-in-roblox_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/free-roblox_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/how-to-get-free-unlimited-robux_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/coin-master-free-spins-link-march-2021_GM406889139.pdf
    • http://opac.stiesa.ac.id/repository/coin-master-free-coins-link_GM406889139.pdf
    • http://opac.stiesa.ac.id/repository/rblx-gg-free-robux_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/www-roblox-robux_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/minecraft-116-free_GM479516143.pdf
    • http://opac.stiesa.ac.id/repository/coin-master-free-spins-daily_GM406889139.pdf
    • http://opac.stiesa.ac.id/repository/free-spin-hack-coin-master-2021_GM406889139.pdf
    • http://opac.stiesa.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://opac.stiesa.ac.id/repository/free-minecraft-account-generator_GM479516143.pdf
    • http://opac.stiesa.ac.id/repository/games-that-give-free-robux_GM431946152.pdf
    • http://opac.stiesa.ac.id/repository/coin-master-pc-game-free-download_GM406889139.pdf
    • http://opac.stiesa.ac.id/repository/pubg-uc-seller_GM1330123889.pdf
    • http://opac.stiesa.ac.id/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000527c.bin
aa6d0fc9abccb41e8683cefe2667e1832d8c0d798554ba5689a889654a8eec4f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x527C 27332 bytes
font_01_sfnt_off000090c1.bin
da3a5645256ddfbec1faa5f72881555776760afa85e4da5ab5e4647731130647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90C1 3076 bytes
font_02_sfnt_off00009b68.bin
d4b621edf5ac5f073c5a65dd804db4f1f2ad13c123c1b5ace541ce5f5c284f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B68 18892 bytes

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