Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d12a21c2271168…

MALICIOUS

PDF

45.6 KB Created: 2021-06-03 05:15:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 677507a046b6934ad5f8ccd06a2ca686 SHA-1: 6b2a30b1e984d84ba4abedfb15ece60aaafe483b SHA-256: 51d12a21c22711688d6724fab716a7226fa759ce1e76af6c973808d5350ba903
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are part of a link farm, directing users to websites offering game cheats and hacks. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests the document is designed to redirect users to potentially harmful content. The document body, though partially corrupted, contains references to "Free Robux Websites 2021" and "wkhtmltopdf", reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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/free-robux-websites-2021-game-hack
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-free-cards-link-2021-today_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-spin-hack-link_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-game-hack-app_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/how-many-villages-are-in-coin-master_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/how-to-hack-coin-master-spin-ios_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/roblox-robux-hack_GM431946152.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/how-to-get-free-robux-promo-codes_GM431946152.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/how-to-make-a-roblox-group-for-free_GM431946152.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-code-hack_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/lazyblocks-com-free-robux_GM431946152.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-daily-free-spins-2021_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/minecraft-hack-2021_GM479516143.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/free-script-executor-roblox_GM431946152.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/free-robux-websites-no-human-verification_GM431946152.pdf
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-coins-free_GM406889139.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/roblox-robux-hack-generator_GM431946152.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/roblox-robux_GM431946152.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/pokemon-go-3-free-raid-passes_GM1094591345.pdf
    • http://e-library.akbid-purworejo.ac.id/repository/how-to-change-username-on-roblox-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005269.bin
21b12b07a87fe589b845d8520271a4a659009415f9aa91f9e641c994a89a0435		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5269 25464 bytes
font_01_sfnt_off00008e08.bin
ef44fc6ccc8558fc54da3394cf76e38d99de94399ef86c3bb36f5b939f331685		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E08 18836 bytes

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