Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ea191f1806cedd…

MALICIOUS

PDF

42.8 KB Created: 2021-05-13 22:00:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c9dc7e335a87785d4c7625dfaf2edf09 SHA-1: e45809c423cfbaaf8e1b546e00f1aab4ddd458cb SHA-256: b4ea191f1806cedd8f28629f03de8ff4c169310057e5a29ac479b95d832e17b6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirector infrastructure, specifically promoting 'free unlimited Robux' and game hacks. The document body and embedded links strongly suggest a lure to entice users to click through to potentially malicious websites. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a malicious redirector workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-unlimited-robux-game-hack In PDF document text
    • https://www.hotschool.com.au/images/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.hotschool.com.au/images/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • https://www.hotschool.com.au/images/kachifpro_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://www.hotschool.com.au/images/robux-prices_GM431946152.pdfIn PDF document text
    • https://www.hotschool.com.au/images/archery-master-3d-unlimited-coins-hack_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.hotschool.com.au/images/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://www.hotschool.com.au/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • https://www.hotschool.com.au/images/hack-download_GM431946152.pdfIn PDF document text
    • https://www.hotschool.com.au/images/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.hotschool.com.au/images/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.hotschool.com.au/images/minecraft-esp_GM479516143.pdfIn PDF document text
    • https://www.hotschool.com.au/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.hotschool.com.au/images/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • https://www.hotschool.com.au/images/hack-coin-master-ios-download_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_off00004629.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4629 26124 bytes
SHA-256: fda9f571f16d632aac5766e635cea472da7cdf86dd634a6b82e08d8b857e2e49
font_01_sfnt_off000082f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82F7 18932 bytes
SHA-256: c9ac8ff14f07bfa737a68dd52966d36d325e06134ccd0dbc32924edcfa3e5a8c

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