Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b19f19a888347f5…

MALICIOUS

PDF

43.0 KB Created: 2021-05-19 05:09:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: aba9c0bb97f150340ac2e0965148dcd3 SHA-1: d3c3b00486e45f58dce82f2894c1a6a25f76f84b SHA-256: 6b19f19a888347f595a3c45464af41a294586338feb142c12b07bdf832ccda87
90 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, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/unlimited-coin-master-free-spins-game-hack PDF link annotation
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spin-app-reviews_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-daily-gifts_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/real-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-link-app_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-script-executor-free_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/robux-free-c_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_off00004a4a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A4A 25896 bytes
SHA-256: 02930b4a5729a53e5bfed648694676addb941c1d1ab01f2196c08c3f0c8e5c26
font_01_sfnt_off000084ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84EE 18580 bytes
SHA-256: 8174e31e86101b13b9901149211171076a60a6b50e3f7464e0ceab7d787638aa

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