Malicious PDF — malware analysis report

Static analysis result for SHA-256 884421617ec635f6…

MALICIOUS

PDF

33.9 KB Created: 2021-07-20 09:53:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 060ceb95c0e8ab6c01de2b0323442139 SHA-1: d4efc62f747ec90ce9390508086f91475dad3b9a SHA-256: 884421617ec635f6231601f6f32a5dee50caeb3b5a20032cacbff9f1168213a5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures. The primary redirector URL is http://netcdn.tw/app/479516143/free-minecraft-account-and-password-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector workflow designed to lead users to potentially harmful content or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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/479516143/free-minecraft-account-and-password-game-hack In PDF document text
    • https://altc.de/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://altc.de/images/free-robux-real_GM431946152.pdfIn PDF document text
    • https://altc.de/images/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://altc.de/images/free-robux-link_GM431946152.pdfIn PDF document text
    • https://altc.de/images/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • https://altc.de/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://altc.de/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://altc.de/images/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://altc.de/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://altc.de/images/hacks-to-get-free-robux_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
font_00_sfnt_off000030da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30DA 22288 bytes
SHA-256: 3f70cd9c0258ba60a5fee688f8f8c68c10e87f9725c80b321c20a2de457c5a75
font_01_sfnt_off00006277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6277 18344 bytes
SHA-256: 071cc331fbe0dfc1a6c0e7c1f1383f87707aabc4deba919dc9b38235f2b9b975

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