Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9215255f3cb0451…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 06:48:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0e1a217246bf60e99987e7bf28ef4ec9 SHA-1: 95e131b13f6036ed1a91f5a3fcf347e9bc7969ab SHA-256: c9215255f3cb0451d3f6a75495daba5006f3b532c8cddf7c3fee59279e6570ba
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The embedded URL 'https://netcdn.online/app/431946152/free-robux-codes-generator-no-verification-game-hack' is a primary indicator of this malicious redirection. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a social engineering attack aimed at tricking users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/431946152/free-robux-codes-generator-no-verification-game-hack In PDF document text
    • http://mbbs.hr/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coinmaster-com_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-admin-roblox_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-tiktok-likes-quick_GM835599320.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/robux-get-com_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-gratis-hack_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-download-ios_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_off0000522e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x522E 26252 bytes
SHA-256: 6415c1e3d55f1751aa0dc0d0e33d1faaebafb1c5b1a8c444dc470fba9a128b30
font_01_sfnt_off00008e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5D 18776 bytes
SHA-256: a4a7f46a8ec4e4fe0089faa119d4be48f59112184e2c655defb35f5102acccee

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