Malicious PDF — malware analysis report

Static analysis result for SHA-256 5113a477c9ff0c66…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 10:16:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d47a3773bfd9e328d76c2f639854d7f3 SHA-1: 7a381120c0fde2049a15ff927c17485296c89aa1 SHA-256: 5113a477c9ff0c66370b2e80da47f206745f206172321997440c5d74f7088fc3
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/431946152/where-to-get-free-robux-game-hack PDF link annotation
    • http://elibrary.perludem.org//repository/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/claim-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/all-coin-master-spin-link-and-free-download_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-mod_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-free-draw_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-robux-without-downloading-anything_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_off00005273.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5273 25960 bytes
SHA-256: ce6bce036a7312e3aa4e147cf32d38ecdf1af1dca363961584aabe4ee4b94c54
font_01_sfnt_off00008d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D51 18484 bytes
SHA-256: fb52c80d186d334eb1da06902c7e87ffbc7c7b48a2b49bbb6429fdd2e0d05906

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