Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdda020f4da0471…

MALICIOUS

PDF

46.0 KB Created: 2021-06-09 00:59:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6a540fe877b9105c0110377e2680d2ac SHA-1: a99324377c5db900b7c973dada39aae23913c54d SHA-256: 2cdda020f4da04712d53fa64e78e160bfc7012e7ba0e03c2931c0da77affc3fc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, that point to websites offering 'free Robux' or game hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' lure further supports a malicious intent. The primary goal appears to be directing users to potentially malicious external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/how-to-give-yourself-robux-by-hacking-game-hack PDF link annotation
    • http://pustaka.fkg.unand.ac.id/repository/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/best-free-stuff-in-the-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/go-to-gg-com-to-get-202120212021202120212021202100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/hack-cojer-cosas-del-catalog-sin-tener-robux_GM431946152.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
stream_004_off000052b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52B0 25752 bytes
SHA-256: acbee499a186d75179de258cdbe41d44f79d84a3ad319f7e32f23803479caebd
font_01_sfnt_off00008e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E1A 19348 bytes
SHA-256: a67b13588221a07512f04328b18a67a896473a39d88e49b7316d1a7ba36366f4

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