Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4cc71df1bbc5df…

MALICIOUS

PDF

35.4 KB Created: 2021-06-18 16:54:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 56a669e5434477b488dc876c1c67d740 SHA-1: 934850742074fd2fd7f106f20bac8b66b09a7217 SHA-256: 4e4cc71df1bbc5df1e6a9b3c237cf7b308aea8e465ff4d3d6a38c304849b728f
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 hosted on academic domains but use SEO-like slugs to appear legitimate. The primary URL, http://netcdn.co/app/431946152/free-robux-that-actually-works-2021-game-hack, suggests a lure for free Robux, a common tactic for distributing malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, and the ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and numerous external links suggest the PDF is designed to redirect users to malicious sites, likely for malware download or phishing.

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/free-robux-that-actually-works-2021-game-hack PDF link annotation
    • https://digilib.stieama.ac.id/repository/can-i-get-free-robux-please_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-bandit-simulator-codes-new-hacker-update_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-hack-on-roblox-no-email-or-no-password_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/hacked-roblox-account-and-banned_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-400-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coomo-ponerse-hack-en-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-roblox-accounts-with-obc-and-robux-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-hack-roblox-with-hydra_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_off000030d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D0 22244 bytes
SHA-256: d3ff1ef7030aaadecd6551666f76ebada44cdc6989dc84fe5b8353f85157e76e
font_01_sfnt_off00006283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6283 20008 bytes
SHA-256: 8708610d65edee27054ce301a9bd75c7c559fd6231599c341fc0984ebcbede77

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