Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2ae3a53e0900ef…

MALICIOUS

PDF

42.8 KB Created: 2021-05-16 04:08:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d0e537f360fc47eb91a44d54840c9a55 SHA-1: 807473eb3e566e40892297e221f67dfce53c1356 SHA-256: fc2ae3a53e0900efd032579c4c4553ba238c9a14e13dba75aa3955b839ce68df
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for 'free Robux' and game hacks, directing users to a suspicious URL. The ML classifier strongly indicated maliciousness, and the embedded URL heuristic confirms the redirection attempt. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-only-username-no-human-verification-game-hack PDF link annotation
    • http://windhorsetrek.com/userfiles/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-ftw_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-download_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/minecraft-windows-10-free-with-java_GM479516143.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_off00004a10.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A10 24336 bytes
SHA-256: 6a7af67ba30fba7a148676c319e8f76aee64b81f434e80fe52ea2d2f1c2c7045
font_01_sfnt_off00008214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8214 19300 bytes
SHA-256: 0069d31deed1bc6c2f872d57868e98b772485fef1053c0a123ffd6dc6d604850

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