Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee1114c64112302…

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 14:01:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7c7316eff05945e1493bca57705f1794 SHA-1: 6f90efb5abaa4eb23872c0acd3b6169295fef2e6 SHA-256: 5ee1114c64112302fd062022141eb554a3734ca174ee04211feb14dfb9a1b897
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to attract traffic. The ML classifier strongly indicated maliciousness, and the presence of numerous URLs suggests an attempt to direct users to potentially harmful content or phishing sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a malicious intent to redirect users.

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/479516143/what-is-a-minecraft-client-game-hack PDF link annotation
    • http://pustaka.fti.unand.ac.id//repository/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/tiktok-free-views-apk-download_GM835599320.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/rewards-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-free-spin-and-trading-group_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/earn-robux-com_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/real-working-coin-master-hack_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_off0000551a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x551A 25536 bytes
SHA-256: e69117f22d9fb9fcd404c0d4aebdfb9d89e87f9617084956c8c86fe309de8c83
font_01_sfnt_off00008e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E17 18008 bytes
SHA-256: f402f21c661d1e01b215e02d2fc5d7c867c0257932a901a78bdda083b1da0465

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