Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21420552eba9f4e…

MALICIOUS

PDF

36.5 KB Created: 2021-06-19 14:18:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 61011fae647c2231ad69898f492e9359 SHA-1: 20cd920a1c5f6e3ae1f19e5103fac6c4584cfb7d SHA-256: a21420552eba9f4ea4c736fbcc108bb3d557d43d84f5488e122b7f1157e5466b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a document body referencing free Robux and game cheats, indicating a phishing or scam attempt. The PDF_SEO_LINK_FARM heuristic suggests a large number of links were generated, likely to distribute malicious content or redirect users to scam pages. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of this document.

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/how-to-get-free-robux-pastebin-2021-game-hack PDF link annotation
    • https://pustaka.widyakartika.ac.id/repository/roblox-cheats-for-robux-and-tix_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-spin-link-in-coin-master-game_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/youtube-free-fire-tik-tok_GM835599320.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/tiktok-free-to-watch-online_GM835599320.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/money-woodcuting-simulator-hack-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/what-will-happen-if-i-use-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-lumber-tycon-2-menu-no-cheat-engine_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-blox-no-hero-academia-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/cheat-codes-for-jail-tycoon-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/play-free-games-online-without-downloading-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/tiktok-free-cuthbert_GM835599320.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/hack-for-roblox-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-money-cheat-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-roblox-place-visits_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-place_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spins-cheat-codes_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_off000035a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35A6 22552 bytes
SHA-256: 9487ef7ebaa72f4659ca9fa74dab21fa4820c77d02f4db9b24a08f89165bd486
font_01_sfnt_off000067ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67EC 19660 bytes
SHA-256: b6d9dd824ab6cea2b38cdf622162ff9bdf4e4493ac08e70c90d595cf9f3dc2c3

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