Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b27f73ec7cab8d…

MALICIOUS

PDF

34.6 KB Created: 2021-06-18 05:46:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 66800f386b2fa3f3c4a545e606ccef9e SHA-1: 94320af7f08f8c2574b2ec32de8aea2ed6cb8139 SHA-256: e1b27f73ec7cab8d0b06015a5cbcd31f6a6b6220078314ed2ed8ac123bb4ec83
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are presented as guides for obtaining free in-game currency or cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-how-to-get-robux-for-free-2021-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id//repository/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-unlimited-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hacker-de-robux-para-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-no-hacks-or-inspect_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-generator_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DB4 22744 bytes
SHA-256: 0e0755bd5ff9a6c97e6db020c3163c2c83cbb93413e31790cc9f5fa91e868d6f
font_01_sfnt_off000060bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60BD 19460 bytes
SHA-256: a4108f87f97ab3242f71e9eca3342e71017872ca9f14348fce8d64373898ce68

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