Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b50656cfd7bf534…

MALICIOUS

PDF

43.4 KB Created: 2021-05-17 07:33:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 80f57cdb8014cdf8c835c45e48ad013f SHA-1: 9a1bc60c493d0df443e4d3e0a846913e86fbf73f SHA-256: 9b50656cfd7bf5343efb4bc375aee8fc583232c847f152d3db629f7e6bd94427
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a lure related to 'free Robux' and 'game hacks', indicating a social engineering attempt to trick users into visiting malicious websites. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports this assessment. While no scripts were explicitly extracted, the document's structure and content suggest it's designed to redirect users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/free-robux-no-verification-no-download-2021-game-hack PDF link annotation
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/roblox-sexually_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/coin-master-free-cards-and-spin-link_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
stream_003_off00004b15.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B15 24528 bytes
SHA-256: bbc1c56a0bc97c8eb0a002ca57bd80b90ec428b6beb8933c1ecd94510dc12511
font_01_sfnt_off00008345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8345 19584 bytes
SHA-256: 6d060c19cfdcabcdc6bddd80792e5ccefe5b0efd90c0cd3f16f1565492dd4e8c

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