Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a442134a3492df…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 17:37:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: af94a184511c99ba859d3bde2d72acb2 SHA-1: 6dabbe045cb8a2374df3f8ad103b52a11c4e2c2f SHA-256: c4a442134a3492df616a1342a9a0ce31f85bf8b38b777c4dcd0713702a786a1d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a critical redirector at http://netcdn.tw/app/406889139/wwwcoin-master-hack-apk-game-hack. This redirector is associated with lures for game hacks and in-game currency, suggesting a phishing or scam attempt. The presence of numerous similar PDF files hosted on tena-g.hr further supports the malicious intent of distributing these lures.

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/wwwcoin-master-hack-apk-game-hack In PDF document text
    • https://tena-g.hr/files/robux-today_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/fly-hack-for-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/robux-generator_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/draw-free-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-200-spin-link_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-com-free-clothes_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-space_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_off00002f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F87 22256 bytes
SHA-256: 00373b68d544654707d196fb2b321a0424860489ed6d14bd1265d6963bf5553d
font_01_sfnt_off000060d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D6 18544 bytes
SHA-256: b520c3bc7ebd8c42fe6eeca2240ec3f866f18b07b49e0828198d0e3037460273

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