Malicious PDF — malware analysis report

Static analysis result for SHA-256 720817f3044754cb…

MALICIOUS

PDF

47.3 KB Created: 2021-05-11 12:43:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 582a33c2e7e60b70222af2a3763cd6fb SHA-1: ab97bccf317c859a9d32161e1e0b3c8f3a34cb5a SHA-256: 720817f3044754cb995e74aef8d44e0777777bb7aac36c3d56caaeff85f9c8c5
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a game hack lure to entice users into clicking embedded links. The primary link, https://netcdn.xyz/app/406889139/coin-master-daily-free-spins-link-today-haktuts-game-hack, and numerous others hosted on edu.kyst.com.tw, likely lead to malicious websites designed for credential harvesting or malware distribution. The ML classifier strongly indicated maliciousness, supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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-daily-free-spins-link-today-haktuts-game-hack PDF link annotation
    • https://edu.kyst.com.tw/image/data/files/coin-master-spin-link-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004efd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EFD 25364 bytes
SHA-256: a4bdd786a9ada1659ee75539c5daf3372cc7866570b1a40c27e3b7c1a0a33c30
font_01_sfnt_off000089ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89CA 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off000094f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94F3 18792 bytes
SHA-256: 134988fea06afbf49125976edeb042ab585c1fa975de478a6ecfabe8eedb10d1

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