Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cd4f8533cbe24b…

MALICIOUS

PDF

45.2 KB Created: 2021-04-29 04:23:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c77795639649f2c505ccc480ad05e70c SHA-1: cd7fc5819d7e963332bb782eb1ecc1c7a9598e7b SHA-256: f9cd4f8533cbe24b9f98dbd8ed41cb1c6477600e6122ab2f227a059fa08892e5
82 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 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 0.9858

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/hack-de-robux-gratis-game-hack PDF link annotation
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/how-to-get-8-robux-free.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/op-free-robux.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/how-to-get-free-robux-easy-real.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/how-to-get-your-robux-back-without-hacking-or-buying.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/roblox-free-tix-hack.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/how-to-hack-arsenal-roblox.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/free-robux-number.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/imperium-roblox-hack.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/cb-ro-roblox-hack.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/free-robux-generator-unblocked.pdfIn PDF document text
    • https://freerobux.cyouIn 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_off00004502.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4502 26624 bytes
SHA-256: 0bd52a3b5d6c9a88c828f106ac4f1b32690b674b0addf2f072c38a6b73298357
font_01_sfnt_off000080e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E7 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00008d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8E 18640 bytes
SHA-256: 9aa340ef83ac2a7ca1ca2e9cea42229f42e0fe757590ddea75146e6290829f7d

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