Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dba4b7cd6aeba88…

MALICIOUS

PDF

39.5 KB Created: 2021-04-29 21:36:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4293aaa899d4eff0fc30aec5c804889f SHA-1: e29f9ade0fe05790dd10783d3c2feff3926649a8 SHA-256: 3dba4b7cd6aeba88848378f7afd63cd5170f9e7c2e993f2be6caabc5a47dd90d
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 "free generator / game hack" lure. The document body, though heavily obfuscated, contains references to Roblox game hacks and URLs, reinforcing the lure. The presence of multiple links and the ML classifier's high confidence score indicate a deliberate attempt to redirect users to potentially harmful content, likely for credential harvesting or 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/clone-army-free-roblox-game-hack In PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/robux-hack-no-human-verification-2021.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/robux-hack-no-survey-no-download.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/how-to-make-free-admin-game-roblox.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/3-games-that-will-give-you-free-robux.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-login-free-robux.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/descargar-hack-pc-robux.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/robux-hacks-admin-commands.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/phoenix-signs-hack-roblox-account.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/how-to-get-robux-for-free-without-human-verication.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-piano-hack.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_off00003f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F4C 24744 bytes
SHA-256: 874548e81aafacf622de7dd45782de9cdc50842fcf32f0b8cad329d8159cd22a
font_01_sfnt_off00007851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7851 18388 bytes
SHA-256: 1fa375ffd36767f27c62a6e647880ebf2d99b398fa11d160acb12248c8c00a1d