Malicious PDF — malware analysis report

Static analysis result for SHA-256 b491f57ec01443ee…

MALICIOUS

PDF

42.4 KB Created: 2021-05-10 23:23:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 16b7363d482389ae579bae4ea45ecd13 SHA-1: 1d3987d326d17df9f7b31d652d1c3e13c4f54901 SHA-256: b491f57ec01443ee810fc9b14c93a633df4454ded9e61caa8951e08e78075238
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 0.9971

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/406889139/coin-master-cheats-for-free-spins-game-hack PDF link annotation
    • https://opac.heritagejkt.org/repository/coin-master-free-coins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/minecraft-free-download-laptop_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-hacks-for-spins_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-robux-wheel_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/robux-page_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-generator-no-human-verification_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_003_off0000499e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x499E 25360 bytes
SHA-256: fb8cd4007f32d64949e9afc0449b23b85b7b2e6568a84ffabf93bdeecc4e7564
font_01_sfnt_off0000841e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x841E 18052 bytes
SHA-256: 78e09613e9051ea2c05113a2cb3e2459165660dd7357248de65be6b789990433

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