Malicious PDF — malware analysis report

Static analysis result for SHA-256 831b10c83462b705…

MALICIOUS

PDF

40.6 KB Created: 2021-04-23 21:14:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 99270e91895b334f62607b49110c45bf SHA-1: aa259ac1c5772c682575b72f3152b245532e8e40 SHA-256: 831b10c83462b705666bf5b4d991d75e5fed6912c387b26b3e1e8f5ef292008f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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://netsecure.top/app/431946152/hack-robux-with-no-gift-card-game-hack PDF link annotation
    • https://sitecontabil.com.br/ckfinder/userfiles/files/claim-free-robux-2021.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/hack-site-robloxcom-robuzx.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification-2021.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/horizon-in-roblox-money-hack.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-hack-granny-roblox.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-galaxy-arcade-resourcen-cheats.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-do-a-roblox-hack.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/hacker-names-roblox.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/top-10-free-items-in-roblox.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-do-you-hack-a-roblox-server.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_off0000412b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x412B 25012 bytes
SHA-256: 781419c9585d4d6402ff8ee4598938c70c6821064cb025207b8c817833108747
font_01_sfnt_off00007ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB4 19008 bytes
SHA-256: f0d7b4cba7846f20874e3a309cb884463c423093243ff646b20bf90b756bc81e

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