Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5bd3e6a6f24655…

MALICIOUS

PDF

40.5 KB Created: 2021-04-27 10:49:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0201a0143a759a3b976625f0b9e17c28 SHA-1: f6ec717188c1702bd607bb1f8e2ee6e1f166d145 SHA-256: 0c5bd3e6a6f246550185b2b69701b85a5d1c4d85c275e6619a073de752359a2d
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a prominent call-to-action to a URL associated with "game hacks" and "free generators" for Roblox. This strongly suggests a social engineering lure designed to trick users into downloading malware or visiting a malicious site. The heuristic firings confirm the use of a game hack redirect lure and a password-protected archive lure, indicating a multi-stage attack. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-stuff-on-roblox-mobile-game-hack PDF link annotation
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-doge-head-on-roblox-for-free.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-play-a-game-that-cost-robux-free.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/guava-juice-robux-hack.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-roblox-toy-redemption-codes.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/blox-fun-info-free-robux.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-robux-skin.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-hack-into-files-to-get-robux.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-cheat-engine-download-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/download-games-to-get-free-robux.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-obby-gives-you-free-robux-july-no-password-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_off000040a9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40A9 26100 bytes
SHA-256: 0275ba095c55dfd49abbc48a1f644c509ae10af810ef46efb98b44e4e0317406
font_01_sfnt_off00007bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEC 18508 bytes
SHA-256: 9004cc0923678aeef6b17b2f1a8d896b264c05f4e9a3c5e53efa3969b419740c

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