Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be5bc1cc9042fa1…

MALICIOUS

PDF

41.8 KB Created: 2021-04-30 16:53:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f2f71b8a5c35a73a550bbb9750a7e1da SHA-1: 4036ac61f7d8b0bb3bb8e5963b4dcd1cd950324a SHA-256: 2be5bc1cc9042fa1460b90c59497df32959efc166dfe4390155e63551ec22a22
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one that redirects to known malicious infrastructure, disguised as a 'free generator / game hack'. The document body, though heavily obfuscated, contains text related to 'Add Robux For Free' and references to wkhtmltopdf, suggesting a lure for game-related cheats. The presence of multiple malicious redirector links indicates a clear intent to lead the user to harmful content.

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/add-robux-for-free-game-hack In PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-hack-roblox-robux-2021.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/guess-that-song-cheat-list-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/cant-open-cheat-engine-with-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-pro-roblox-gear.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/gamekit-roblox-free-robux.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/roblox-aimbot-hack-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-use-cheat-codes-in-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/cheats-for-roblox-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-hack-a-players-account-on-roblox.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_off00004341.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4341 27024 bytes
SHA-256: 5235610e306db6a4053c4b5f18ee055b70b8829433f07f87c94e6448a19a51d0
font_01_sfnt_off000081d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81D5 18188 bytes
SHA-256: 3472191da37d3c3b5cad2a31bc31237442401233919a6c3cd435ab867ad7d4e9