Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d20a67e9b2765c…

MALICIOUS

PDF

42.0 KB Created: 2021-05-15 10:04:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c3ca0b11d957868ab53f7f45164f7c89 SHA-1: ee1df63a99c75022f27ad5585f1a00b123e7acc5 SHA-256: e2d20a67e9b2765cfe676f7077b741b5e6addad3ce06ea1ecf75572d6630caf7
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/coin-master-free-spins-youthnow-game-hack PDF link annotation
    • https://sundae.co.th/js/userfiles/files/generator-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-free-exploits_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/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-promo-codes-2021_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_off000049cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49CD 24796 bytes
SHA-256: 7725c80837e40e680a9f31802563e1679486724e68d8cd6006bcaa1af91db05b
font_01_sfnt_off00008114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8114 18516 bytes
SHA-256: 2d9e93df29aa51ca1a7d67cf2404b131feb62ab03f4d0f4d21f6bd2b7fc99d70

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