Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ca80df592366a2…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 18:48:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0ff6f0f75d6024a6800ea843e2db4122 SHA-1: fe4f88ba03af2b6b0d8bbd48dd1f15ed22022987 SHA-256: 16ca80df592366a2efc4cf2e8a0e8631ab72dd7eb2872a6b62e03c8240099b54
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, many of which are SEO-optimized and point to sites offering cheats or free currency for popular games. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic further supports a malicious workflow. The primary attack pattern involves luring users to potentially malicious websites via these links.

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-food-game-hack
    • http://digilib.stimlog.ac.id/repository/how-to-free-robux_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/tryrbx-site-free-robux_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdf
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-pokeballs-in-pokemon-go-2021_GM1094591345.pdf
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-mod-game-download_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/minecraft-creative-mode-free_GM479516143.pdf
    • https://digilib.stimlog.ac.id/repository/free-coins-and-spins-coin-master_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/minecraft-free-download-ios_GM479516143.pdf
    • http://digilib.stimlog.ac.id/repository/free-robux-groups-2021_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spons-apk-2021_GM406889139.pdf
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-apk-35-13_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/coin-master-hack-online-pc_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/how-to-become-a-hacker-in-roblox_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/coin-master-daily-bonus_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/minecraft-maps-pe-free-download_GM479516143.pdf
    • https://digilib.stimlog.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000500b.bin
d265cd64aae42b62a4c8a66a154ed4f5f857412ed39f8a8178b5450f2c9572d9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x500B 25076 bytes
font_01_sfnt_off0000892d.bin
dce98ab1a9f6331dfaabbdd57dacdba92c66b57249d10e9c2a1df39138c2a47b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x892D 17884 bytes

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