Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f958d8133b67fa5…

MALICIOUS

PDF

40.1 KB Created: 2021-04-30 16:13:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4d2a03cc8778b78990e6436d2b36a152 SHA-1: 75bb74654cc674f47a409aa42df408f0e1689e13 SHA-256: 8f958d8133b67fa5cc3e0c59b9818caf26edf39f7980806dd28b04bdb96c92d6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and text promoting 'Free Robux' and game hacks, which is a common lure for phishing and malware distribution. The heuristic firings, particularly 'PDF_GAME_HACK_REDIRECT_LURE', strongly indicate a malicious intent to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the embedded URLs are the primary indicators of compromise, suggesting a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-no-human-verification-at-all-game-hack PDF link annotation
    • https://www.malesse.com/ckfinder/userfiles/files/free-roblox-accounts-2021-bugmenot.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-free-robux-hack-2021.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/how-to-get-free-robux-without-a-human-verification.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/como-hacer-hacks-roblox.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/botton-complex-free-robux.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-free-girl-clothes.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-apk-mod-unlimited-robux-free-download.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/island-royale-roblox-free.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-how-to-get-free-hats.pdfIn PDF document text
    • https://freerobux.cyouIn 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_off0000402b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x402B 24812 bytes
SHA-256: 940071958f61f2805cdcc414904642dc638602d7cc2afa2733642a9e431d2b86
font_01_sfnt_off00007924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7924 18932 bytes
SHA-256: 68cba6e90e5723d7b330819d70f633f406c6bf180eff9aac8fc63ace37091d71

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