Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0861dd34df34ce7…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 06:37:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2ad1620317873a76316eca77b5ef8bd2 SHA-1: ef6bf84c63495216d3688b4b626af729460768fc SHA-256: c0861dd34df34ce788cc0db21a00f3ccc759d6bdefb7390fccc11785d23888e7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a common lure of free game hacks and currency to entice users. It contains multiple embedded URLs, including a primary malicious redirector at http://netcdn.tw/app/406889139/coin-master-hack-apk-download-game-hack, which likely serves as a gateway to further malicious content. The document's structure and embedded links strongly suggest it is part of a phishing campaign designed to lead users to potentially harmful downloads or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/406889139/coin-master-hack-apk-download-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/anti-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/code-hacks-for-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-parkour-hack-2021-script_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/robux-withdraw_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-install-free_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/master-hack-coin_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-find-free-items-in-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-adopt-me_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-pin_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-hack-noclip-download-pc-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-easy-no-download_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_002_off00003163.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3163 22420 bytes
SHA-256: 0cf4fdc45a9be8df675ebc5379a1f68ff8bc622c6ef7823a4a48e1919ff17f2b
font_01_sfnt_off00006376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6376 18760 bytes
SHA-256: e0717da7bc261f17ea8f419e12a90ec9f2f0bf974bdb9909681cf6939735c129

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