Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31f5aedf7f8ce90…

MALICIOUS

PDF

34.1 KB Created: 2021-06-29 09:47:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6f52b2506554771dafa8cd914b73fab8 SHA-1: 7c1c027db72a91fbbfddee4f8c1fa3dc54a0949c SHA-256: d31f5aedf7f8ce90321e8a11a4afb8deb633a16fe6b452d154ebeb32915ebd3a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to 'netcdn.co', which is flagged as a malicious redirector. The document body and heuristics indicate a lure for game hacks and generators, likely to lead users to malicious websites or download further malware. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious intent.

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.co/app/431946152/case-clicker-hack-roblox-game-hack In PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/roblox-pre-hacked_GM431946152.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/be-a-parkour-ninja-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/robux-hack-2021-on-laptop_GM431946152.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/videos-de-como-hackear-cuentas-en-roblox_GM431946152.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/free-roblox-face-codes_GM431946152.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/roblox-hacked-remotes_GM431946152.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/hacks-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/how-to-get-more-robux-using-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/roblox-aimbot-hack-v3rmillionm_GM431946152.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://www.kdlscaffolding.ie/uploaded_files/userfiles/files/robux-rewards_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_off00002f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F9A 22188 bytes
SHA-256: dbbea9fa1ab10519f680e8c90bbf7397ac754c4586e28d6264597592af00a215
font_01_sfnt_off000060d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D0 18776 bytes
SHA-256: 48b9e6a4484519082a4b8773604aab105058875121b473a570c92d3a33ad4c52

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