Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b03aa8a632f306…

MALICIOUS

PDF

37.1 KB Created: 2021-05-21 05:57:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8a37c59797cefc9c1289960a5bb38f1d SHA-1: 50d41a80426231dbfba3af45f1a37046c998987d SHA-256: 66b03aa8a632f306b3cc86ab06c1958b526a771da20a6b44962315206401c77a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, with a primary focus on luring users with 'free Robux' or game hack generators. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' strongly indicates this malicious intent. While no scripts were explicitly extracted, the nature of the lures and embedded links suggests a potential for JavaScript execution or redirection to malicious sites designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/get-free-robux-without-doing-anything-game-hack PDF link annotation
    • https://griyafirdaus.com/ckfinder/userfiles/files/descargar-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://griyafirdaus.com/ckfinder/userfiles/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • https://griyafirdaus.com/ckfinder/userfiles/files/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • https://griyafirdaus.com/ckfinder/userfiles/files/oprewards-com-login_GM431946152.pdfIn PDF document text
    • https://griyafirdaus.com/ckfinder/userfiles/files/how-do-you-get-robux-on-roblox_GM431946152.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_002_off0000339c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x339C 24812 bytes
SHA-256: 6ed9e957f60ad7a71aeffd26d17873841540ac37288a6cc86a11b3a088d286c9
font_01_sfnt_off00006cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBD 19240 bytes
SHA-256: a9e3aa10522a438dd9eef37bb3e7f322f16e38379d063b4a50e22a05dda2bc13

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