Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4833531a492be35…

MALICIOUS

PDF

40.8 KB Created: 2021-04-29 01:00:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 55b7def283c2f432f469d368287755fa SHA-1: f5c9430b5ce53b34b132105768316a9de76c8c5e SHA-256: c4833531a492be354c66c417b85b01f61a27d1e187d6594d0e1792897acb22fd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, masquerading as game hacks or generators. The document body explicitly contains a call to action, 'CLICK HERE TO ACCESS ROBLOX GENERATOR', and numerous URLs pointing to potentially compromised domains hosting further PDF lures. The ML classifier also strongly indicated maliciousness.

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/bloxburg-roblox-cheats-game-hack In PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/hack-para-cambiar-tu-nombre-en-roblox.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/free-roblox-jpg.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/how-to-hack-in-teaming-bit-survivor-roblox.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/how-to-get-free-robux-without-email-address.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/greg-hacker-roblox.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/free-roblox-accounts-2021-discord.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/hack-for-roblox-bee-swan-sumlaitor-may.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/rbxcity-roblox-free-robux.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/free-old-roblox-account-new-may-2021.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/free-animation-roblox-2021.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_off000040a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40A3 26488 bytes
SHA-256: 5f606107094f354faea358bb0ed960f894750f4117d9f96377320ea2aedff7ff
font_01_sfnt_off00007c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C24 18708 bytes
SHA-256: 836ce8a9027d58d9cb8511210897ea30405cc77ee5671bdce480986799fc0e31