Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bc7bd733ef2846…

MALICIOUS

PDF

41.7 KB Created: 2021-05-10 14:36:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e7a095196c5652ace586c9d411967240 SHA-1: fb0c58f22879613da7633e06b25c5370174b28c8 SHA-256: c4bc7bd733ef2846674e49d98a86726b9c90ef6c6d2f75bea3581543b94cf154
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 0.9838

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/479516143/is-minecraft-java-edition-free-game-hack PDF link annotation
    • http://sudamericarural.org/images/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-fan_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003ec7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3EC7 24632 bytes
SHA-256: d17e3666fe7d9396ba008d1cba4f837896c155e138ebb1ffc6417130363e3892
font_01_sfnt_off00007746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7746 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00008156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8156 18164 bytes
SHA-256: 781be49a7702cf06049b723b9768b43598e981f21f4500b8f56603e8064b4811

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