Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f556f8803037b8b…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 08:22:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 24a681f77a402b58966bc38dc537be20 SHA-1: bd8ead1d376ab1027350df6dfe37183884310450 SHA-256: 6f556f8803037b8bb7df3555c145bde60234b9398224a0ff482bc96955f38221
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are structured as a link farm for SEO purposes, pointing to other PDF files. The ML classifier and heuristics indicate malicious intent, likely to direct users to download or access further malicious content. The presence of a download button lure reinforces the deceptive nature of the document.

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-online-hack-tool-game-hack
    • http://lib.stimykpn.ac.id//repository/rewardex-robux_GM431946152.pdf
    • http://lib.stimykpn.ac.id//repository/pokemon-go-free-team-medallion_GM1094591345.pdf
    • http://lib.stimykpn.ac.id//repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdf
    • http://lib.stimykpn.ac.id//repository/coin-master-free-link-today_GM406889139.pdf
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/how-to-download-minecraft-for-free-on-android_GM479516143.pdf
    • http://lib.stimykpn.ac.id/repository/ultimate-free-spins-coin-master_GM406889139.pdf
    • http://lib.stimykpn.ac.id//repository/coin-master-free-spins-apple_GM406889139.pdf
    • http://lib.stimykpn.ac.id//repository/rbxoffers-earn-free-robux_GM431946152.pdf
    • http://lib.stimykpn.ac.id//repository/coin-master-hack-no-survey-or-verification_GM406889139.pdf
    • http://lib.stimykpn.ac.id/repository/free-robux-codes-2021_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdf
    • http://lib.stimykpn.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/appkarma-free-robux_GM431946152.pdf
    • http://lib.stimykpn.ac.id//repository/coin-master-free-spins_GM406889139.pdf
    • http://lib.stimykpn.ac.id//repository/earn-robux-today_GM431946152.pdf
    • http://lib.stimykpn.ac.id//repository/free-robux-without-human-verification_GM431946152.pdf
    • http://lib.stimykpn.ac.id//repository/coin-master-pet-food-free_GM406889139.pdf
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdf
    • http://lib.stimykpn.ac.id/repository/tiktok-free-pro-app-download_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050dd.bin
883879d2bc419796e8fee76fb0413d03242882b5838e05c351396da2653e4d36		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50DD 28448 bytes
font_01_sfnt_off00008c1b.bin
bc6de09e4d4e97b3cf6f96b8406f8eaea30a5a0b458aa8200154f31bbdde785a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1B 17788 bytes

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