Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd7cddafb637089…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 10:36:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7b1c255ed46a21762c73864ec989df8d SHA-1: 9296af8f3b8dfb717aa20b6d207647db1a5636b5 SHA-256: efd7cddafb6370899a893e50e6953c1dbf4f07602cb856501c6a69eb9995fc1e
102 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to resources related to game hacks and free items, suggesting a lure for users to download further malicious content. The ML classifier also flagged this PDF as malicious with a high probability. The presence of a 'download button' heuristic further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/coin-master-free-coins-today-game-hack
    • https://lib.unitri.ac.id//repository/how-do-i-get-minecraft-for-free_GM479516143.pdf
    • https://lib.unitri.ac.id/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdf
    • https://lib.unitri.ac.id//repository/coin-master-real-hack_GM406889139.pdf
    • https://lib.unitri.ac.id/repository/coin-master-free-spins-link-2021-twitter_GM406889139.pdf
    • https://lib.unitri.ac.id/repository/archery-master-3d-unlimited-coins-hack_GM406889139.pdf
    • https://lib.unitri.ac.id//repository/how-to-hack-someones-minecraft-account_GM479516143.pdf
    • https://lib.unitri.ac.id/repository/coin-master-free-spin-link-daily_GM406889139.pdf
    • https://lib.unitri.ac.id/repository/minecraft-free-unblocked_GM479516143.pdf
    • https://lib.unitri.ac.id//repository/coin-master-mod-version-free-download-v344_GM406889139.pdf
    • https://lib.unitri.ac.id/repository/free-spins-coin-master-without-completing-offers_GM406889139.pdf
    • https://lib.unitri.ac.id/repository/minecraft-client-download_GM479516143.pdf
    • https://lib.unitri.ac.id/repository/games-that-can-be-hacked_GM431946152.pdf
    • https://lib.unitri.ac.id/repository/coin-master-hack-no-human-verification_GM406889139.pdf
    • https://lib.unitri.ac.id/repository/coin-master-hack-apk-latest-version-2021_GM406889139.pdf
    • https://lib.unitri.ac.id/repository/coin-master-hack-club_GM406889139.pdf
    • https://lib.unitri.ac.id/repository/free-spins-and-coins-coin-master-link-2021_GM406889139.pdf
    • https://lib.unitri.ac.id//repository/how-to-get-800-robux-for-free_GM431946152.pdf
    • https://lib.unitri.ac.id/repository/20210-robux_GM431946152.pdf
    • https://lib.unitri.ac.id//repository/free-spin-link-coin-master-today_GM406889139.pdf
    • https://lib.unitri.ac.id/repository/microsoft-roblox-rewards_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050ad.bin
b35cdcf01ab3fe1b0b911814daa596c80dd7149559ae065ec095b0d8c5af4a93		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50AD 25808 bytes
font_01_sfnt_off00008cf0.bin
e394056c4eb74bb544619b5782ef65607dab53e2149678f6173de5f10ac76a14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF0 18064 bytes

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