Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef86b20cc630875…

MALICIOUS

PDF

42.0 KB Created: 2021-05-17 09:06:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 42f904c40b45c8346060094a14cac8d3 SHA-1: 8f3aaf633a705df7fe68d94bab9190ea6bc1fc86 SHA-256: 9ef86b20cc630875fc181fa265603f84becc036e78be73ab0d465ffd97234314
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' content. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-roblox-accounts-that-work-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or redirection attempt, likely to download further malware or lead to a scam. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/free-roblox-accounts-that-work-game-hack In PDF document text
    • http://www.hlad.hr/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-site_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/moonactive-coin-master-free-spins_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_off0000477c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x477C 25000 bytes
SHA-256: e8d4999f1371f00b87462a5d05d8d3238a2da9fe3e08c945ed2601b2b2860f60
font_01_sfnt_off00007fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEA 18952 bytes
SHA-256: 5a520a129cd8904d435b2c3265355279d09350e58b7119a0e5602aa69de64cf4

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