Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4412dddb93e868c…

MALICIOUS

PDF

44.3 KB Created: 2021-05-01 14:50:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8fa45eb0a3a01d1fb7315970cac52a8b SHA-1: 88a60505a6d9cf12eaf98f45499243f49cf0bd64 SHA-256: c4412dddb93e868c43d00508a6e94f74f34a03425b5396480391d32aa5dd9df4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, masquerading as free generators or hacks for the game Roblox. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-cape-in-roblox-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt designed to lead users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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-cape-in-roblox-game-hack In PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-hack-gui-scripts.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/best-roblox-shirt-maker-for-free.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/gamepasses-for-free-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-free-png.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-immortal-hack-blood-of-iron.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/cheats-for-murder-mystery-2-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-redeem-card-codes-free-2021.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-hack-roblox-with-roblox-plus.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/visenya-roblox-free-download.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-hack-roblox-safe-way.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004183.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4183 28220 bytes
SHA-256: a506f869bd60b95e75f47bc0cb27d3ba49afbfea8567397014a374a395b9946b
font_01_sfnt_off00007fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE7 3312 bytes
SHA-256: 40bd8eebcb3a0d68a8646f1930e84f30a44bfa48525263c6c528f0bc1e9c1677
font_02_sfnt_off00008b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B37 18352 bytes
SHA-256: 980275978f4cbbf0752c1ca3a73da1a14dcf920ca3044e5f0eb5f62c5837d293