Malicious PDF — malware analysis report

Static analysis result for SHA-256 8220c9aa3012a69c…

MALICIOUS

PDF

35.0 KB Created: 2021-06-28 20:17:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bbacb5e148720801fe96d65261a7c1fb SHA-1: 8ce51324558cbf0b1535df32276f7a5d3b3c9621 SHA-256: 8220c9aa3012a69c37156cc474f8d8fba9a06fb286912625ba49f032da215a3e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs related to 'free Robux' and game hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links suggests a link farm or redirection to malicious sites. The document body explicitly mentions 'Get Free Robux Promo Codes 2021' and includes a URL that appears to be a direct download or landing page for such content.

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/get-free-robux-promo-codes-2021-game-hack PDF link annotation
    • http://library.yamasi.ac.id/repository/hgow-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/rocashcom-earn-free-robux-by-watching-videos-and-completing-surveys_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/pain-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-download-roblox-intros_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-accounts-with-robux-march-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-lego-hacking-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-weight-simulator-3-cheat-code-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-exploits-v3rmillion_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-stuff-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-for-maze-runner-roblox-exit_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/cheating-roblox-girlfriend_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
font_00_sfnt_off00003091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3091 22012 bytes
SHA-256: 20d962355943914d5999f8dea94d6a11fb0693cf65736ffbc279e0643dfb37f2
font_01_sfnt_off00006182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6182 19808 bytes
SHA-256: 31080556f8857ce7a4733c1624c748121a61deecc0f0434b0e64263ff95e1437

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