Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f4eaaa57c1e515…

MALICIOUS

PDF

44.5 KB Created: 2021-04-29 06:40:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c9c8ee0655be17a19a948dc24455052f SHA-1: f8e7895c4062d0922428d62623e4622b44353c8f SHA-256: 82f4eaaa57c1e51598eae588787cd4e1e0b069f2359d8b4315f834f6c31ea721
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'free Robux generator' which redirects to a malicious URL. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the nature of the lure suggest an attempt to trick users into visiting a potentially harmful site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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/claim-gg-earn-free-robux-for-roblox-game-hack PDF link annotation
    • https://www.malesse.com/ckfinder/userfiles/files/free-robux-obby-limited-time-only-2021.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/how-to-get-gamepasses-for-free-on-roblox-2021.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-dayz-cheat-code.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/descargar-hack-pc-robux.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-roblox-card-code-generator.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-roblox-accounts-with-robux-list.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-hack-for-android-apk.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-edit-money-value-cheat-2021.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4179 28588 bytes
SHA-256: a5e29ec25126a20126a3b1ed9f6ea42321347dfdeb97cac783aa8ebbb3106417
font_01_sfnt_off0000807c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x807C 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2C 18984 bytes
SHA-256: ca23d816a048280edd807c6830549afe4d62261d673fa62f265c791324f4fdd5

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