Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5c0f5007f6b355…

MALICIOUS

PDF

40.9 KB Created: 2021-05-01 11:42:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 511fc24e48b355de7f62307bc402a717 SHA-1: 706dbcc0da5163b16881fd8a51c0896f0c92194e SHA-256: ac5c0f5007f6b355d918da62198f122048f28ec1b1ed2a1c4229c53ce0a20527
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector leading to a 'game hack' lure. The ML classifier also flagged this PDF as malicious. The presence of numerous links to related 'hack' or 'free item' PDFs suggests a coordinated effort to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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/exploits-roblox-topkek-free-game-hack In PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-any-item-for-free-in-roblox-2021.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/how-to-hack-roblox-client.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-play-heroes-online-roblox-for-free.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-t-shirt-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-use-cheat-engine-on-roblox-swordburst2.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/gamekit-roblox-free-robux.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/roblox-free-roblox-accounts.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-hack-points-on-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-roblox-accountes-with-robux.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_off0000444a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x444A 24764 bytes
SHA-256: dc320b55206a1817ae126d60c5aa85fb4947e54c99363f0583c8180d15e0240d
font_01_sfnt_off00007d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D79 18516 bytes
SHA-256: 0c863b217984a5881f180ef581b43e50525ad8718e21e835d5657b5185b187cd