Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43ff4a07946d90a…

MALICIOUS

PDF

41.1 KB Created: 2021-05-13 09:03:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d9f920b593af37d04db6aa6be739b93d SHA-1: 52ef26bcd70fb760f47e5766b3930dd78d0c7c1e SHA-256: f43ff4a07946d90a1b9f6cdd5bb9379c5c4fd3860751b04df2d84c7b95874f60
90 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, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/roblox-source-game-hack PDF link annotation
    • https://sundae.co.th/js/userfiles/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/worst-client_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/minecraft-education-free_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/earn-robux-online_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-daily_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-executor-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_003_off00004605.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4605 24764 bytes
SHA-256: 3eb295193af3650b998216092a25347c20878c9d5e2fdd590477d7d747ee53cf
font_01_sfnt_off00007f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F46 17924 bytes
SHA-256: de701b1390df5ea6859c32be6292d3183886ea3a2a613b5f80b12093d50b4b47

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