Malicious PDF — malware analysis report

Static analysis result for SHA-256 275542b2547aec2b…

MALICIOUS

PDF

43.8 KB Created: 2021-05-15 04:01:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8cd0d34a29e619dc5e7b77b24f2a27bf SHA-1: 42da2c0a2302e22a38760885eadf6f54c439f331 SHA-256: 275542b2547aec2b6543fb25be0ea07dfad4376d41f120b9b04ff546f271f5e4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one that redirects to malicious infrastructure associated with 'game hacks' and 'free Robux'. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users to click on these links, likely leading to further compromise or scams. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/how-to-earn-robux-for-free-2021-game-hack In PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/real-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/roblox-rewards_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-robux-site_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-pe_GM479516143.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/best-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.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_off00004923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4923 27644 bytes
SHA-256: 81b8aa727a6c4e3ccd4bbd001618d3b70c4d482f3ea63d36462744b82331ec25
font_01_sfnt_off00008728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8728 18808 bytes
SHA-256: 177d88bc60daff4309aceb58336b2ba1d1983158bcd2aa353c0aa46f075a8142

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