Malicious PDF — malware analysis report

Static analysis result for SHA-256 72647a2490cc136e…

MALICIOUS

PDF

49.4 KB Created: 2021-06-11 06:51:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4ca6d86071f360aae04c11b410d9c623 SHA-1: 6a1b2f1461663c7511e1ac292d7d8c2e921836ef SHA-256: 72647a2490cc136e89dd18e024f2dfad08158ccbdbcc965dde18a7ff67c4ab7e
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, suggesting an attempt to drive traffic to malicious sites. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'download button' heuristic further supports the interpretation that the document is designed to trick users into downloading potentially harmful files.

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.tw/app/431946152/nazi-roblox-hack-pastebin-game-hack
    • http://lib.untad.ac.id/repository/is-minecraft-free-on-switch_GM479516143.pdf
    • http://lib.untad.ac.id//repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdf
    • http://lib.untad.ac.id/repository/wwwhacktoolcom-freedownload-roblox_GM431946152.pdf
    • http://lib.untad.ac.id/repository/kuso-ico-roblox-free-robux_GM431946152.pdf
    • http://lib.untad.ac.id/repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdf
    • http://lib.untad.ac.id/repository/tiktok-free-trial_GM835599320.pdf
    • http://lib.untad.ac.id//repository/coin-master-daily-spin-free_GM406889139.pdf
    • http://lib.untad.ac.id/repository/coin-master-mod-version-free-download-v344_GM406889139.pdf
    • http://lib.untad.ac.id//repository/500-free-spins-coin-master_GM406889139.pdf
    • http://lib.untad.ac.id/repository/tiktok-free-fire_GM835599320.pdf
    • http://lib.untad.ac.id/repository/free-roblox-account-with-robux-and-password_GM431946152.pdf
    • http://lib.untad.ac.id/repository/coin-master-hack-game-download_GM406889139.pdf
    • http://lib.untad.ac.id//repository/coin-master-free-link-2021_GM406889139.pdf
    • http://lib.untad.ac.id/repository/hacks-para-coin-master_GM406889139.pdf
    • http://lib.untad.ac.id//repository/pokemon-go-free-quickest-charge-moves_GM1094591345.pdf
    • http://lib.untad.ac.id/repository/coin-master-free-spins-link-2021-twitter_GM406889139.pdf
    • http://lib.untad.ac.id/repository/free-tiktok-views-no-verification_GM835599320.pdf
    • http://lib.untad.ac.id/repository/free-minecraft-mods-for-xbox-one_GM479516143.pdf
    • http://lib.untad.ac.id//repository/free-robux-no-offers_GM431946152.pdf
    • http://lib.untad.ac.id/repository/coin-master-free-spin-27_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054a9.bin
a5908093635be565f46dff327f32799e138931c7fe80935bfe94b51063e810c1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54A9 26548 bytes
font_01_sfnt_off00009342.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9342 2880 bytes
font_02_sfnt_off00009d2c.bin
86c49c01f269c2598bdc026ced351f847ce37fdb98ada3346624d63a720e4bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D2C 18644 bytes

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