Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecbe8e0f553a7d3…

MALICIOUS

PDF

47.2 KB Created: 2021-04-30 19:27:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e7302a2bccdd2016bb49ff008b030cca SHA-1: ccdd2dda8ba81f78289804683d6a0b3e26275450 SHA-256: cecbe8e0f553a7d3cad842e1e2046095b6832a5f3207d32efbe7f3e1cac0d605
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure and websites offering "game hacks" and "generators," which are common lures for malware distribution. The heuristic firings, particularly PDF_GAME_HACK_REDIRECT_LURE and PDF_MALICIOUS_REDIRECTOR_LINK, strongly indicate a malicious intent to redirect the user to potentially harmful content. The presence of embedded URLs and the ML classifier further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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/ads-for-roblox-games-free-game-hack In PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-hack-robux-with-cheat-engine.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-hack-someone-on-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-build-your-dreams-hack.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/roblox-online-roblox-hack.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/anime-roblox-roblox-face-free.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/wwwrobuxhackscom.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-roblox-hacks-net.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-crosshair-hack.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/change-roblox-name-for-free.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/cheats-roblox-vip.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
stream_003_off000042ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x42CE 38780 bytes
SHA-256: cd819d250b070a30d2bc4b690351194aec0f45bbb103e2978c68845bbd96dadb
font_01_sfnt_off00009641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9641 18612 bytes
SHA-256: 3f5ca51a91a22f974f93df3b495d51588e2b63159fa8353d07455ee8ebd41441