Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bad96ec27fcd2f…

MALICIOUS

PDF

42.0 KB Created: 2021-05-11 13:04:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 60b66fb0bc32334cb3b402967492e8ab SHA-1: a0f0863b95251d4d2f6ce049d24646566b3925de SHA-256: c8bad96ec27fcd2fde06b20479716fe47277d7295127f0cafb3a4c31a64a0d9e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified as a link farm, with a primary URL pointing to a 'Coin Master' game hack. The ML classifier also flagged this PDF as malicious. The presence of a 'visual download button' heuristic suggests a lure to encourage user interaction with these links. The document's purpose appears to be directing users to potentially malicious or spammy websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/how-to-get-free-coins-in-coin-master-game-hack
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/roblox-free-robux-no-human-verification_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/how-to-hack-coin-master-game-without-verification_GM406889139.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/hack-coin-master-spin_GM406889139.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/how-to-hack-roblox_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/coin-master-free-spins-2021-haktuts_GM406889139.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/hack-coin-master-free-spins_GM406889139.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/free-roblox-accounts_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/getrobux-info_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/minecraft-jar-free_GM479516143.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/free-spin-link-of-coin-master_GM406889139.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/coin-master-free-spins-and-cards_GM406889139.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/free-minecraft-texture-packs_GM479516143.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/free-robux-generator_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/game-hunters-coin-master-free-spins_GM406889139.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/free-robux-giveaway-live_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c03.bin
27e69b6f2e3412d7ae0b033512482f8d2b2457261f66e9b6e81cb60c7870ced1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C03 25304 bytes
font_01_sfnt_off000082e9.bin
ea6dcb3ab890178a05547e3161835c8edeffae3732ad32b35eba99407f3e1bd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82E9 17872 bytes

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