Malicious PDF — malware analysis report

Static analysis result for SHA-256 c537650b4bf4252a…

MALICIOUS

PDF

41.3 KB Created: 2021-04-28 17:22:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e292858685bda75ebb67a8ccd9814898 SHA-1: 1a8aca0f2614653db14b8e3eaaed715c3924c825 SHA-256: c537650b4bf4252a56302ef0563b388dd378af868b94ee07050b8e45267d6142
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free Robux' and game hacks. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's designed as a lure to a redirector. While no scripts were explicitly extracted, the nature of the embedded links and the lure suggest an attempt to lead the user to a malicious site, likely for credential harvesting or further malware delivery.

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/free-robux-glitch-no-human-verification-game-hack In PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-how-to-get-free-items-in-catalog-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-vip-door-hack.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/comment-entrer-cheat-code-pour-jeux-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-stuff-but-you-have-to-enter-a-code-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-studio-dont-mess-with-me-i-hack-your-place.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/break-free-ariana-grande-roblox-id.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/get-a-free-dominus-from-roblox-toy.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/babe-free-robux.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/cpying-roblox-games-for-free.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-lvl-7-script-executor-free.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_off00004405.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4405 25152 bytes
SHA-256: 1697971bc0e49bbaa5cd4cda7ba22b95e93715f1b7aa3fefab78c0032ec8ea29
font_01_sfnt_off00007d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D55 19100 bytes
SHA-256: 75db1d4e3da35978923a619acc38c769a73856878a7be8e0a75a64b1b85c76d1