Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f96dc96f1052f0…

MALICIOUS

PDF

33.8 KB Created: 2021-07-07 18:32:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e45c0bba5a0d42307724473f1b2e883b SHA-1: 018152bb4bf76cc8948dc34f59e3a42659d31864 SHA-256: a9f96dc96f1052f0fdd019b43fa030ccee31c14c14b096d009d660c170274ac3
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high-confidence heuristic firing for a game hack redirect lure. The document body and extracted URLs promote 'free Robux' or 'free spins' for games, directing users to a URL that is likely to host a malicious payload or phishing content. The presence of embedded JavaScript suggests an attempt to execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/a-lot-of-robux-game-hack PDF link annotation
    • https://sundae.co.th/js/userfiles/files/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/will-uk-rc-redwood-county-roblox-be-free_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-roblox-account-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-link-app_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/pokemon-go-free-km_GM1094591345.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-spins-link-in-coin-master-2021_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
font_00_sfnt_off00002d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D05 22760 bytes
SHA-256: b01583edca15f1ca4f6769e44dd7f8494c85fbb27e2ffb8e2d438595aa88baa0
font_01_sfnt_off0000600a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x600A 18656 bytes
SHA-256: d04e08575e4efc43ec371b195521181e13837c014caa8c6a2ad7539eeb3e7d8e

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