Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba141a3c3a625a9f…

MALICIOUS

PDF

44.7 KB Created: 2021-05-11 04:02:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d74a8cd84d459ea0d8bb238717148e7f SHA-1: 86ff9b331a0b8e725929725ad5ef162f49bccbfd SHA-256: ba141a3c3a625a9f1138c2da65de9e6a1650e28facdefc246bafd4565dc0089b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9632

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/watch-ads-for-robux-game-hack PDF link annotation
    • https://adoz.cz/ckfinder/userfiles/files/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/robux-giver_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-homepage_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/roblox-scam_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-70-spin-link-2021_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/mcpe-optifine_GM479516143.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-free-coins_GM406889139.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
stream_003_off00004941.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4941 24072 bytes
SHA-256: c26554546945fbe1aed91fd70ce1b64cc50c6dd214181eb671f44f706620d57b
font_01_sfnt_off00008041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8041 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off00008a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3E 18884 bytes
SHA-256: b326a3d2522df63c9b2d79b13b63d757e2bef45666281f059e1577b6e2c17aa3

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