Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40b6801bd12f0e0…

MALICIOUS

PDF

44.7 KB Created: 2021-04-29 11:08:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f29af2eadbccd821c2ad24a6517f96b9 SHA-1: ea0fe55d1991e096fc11805fa8e0547c038fd5c7 SHA-256: f40b6801bd12f0e00116e7c9a4296b4db85973950ef4cc853c8091eb5b38b3cd
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document uses a lure related to Roblox game hacks to entice users to click on a malicious URL. This URL, 'https://netcdn.xyz/app/431946152/how-to-get-a-free-hat-2021-roblox-game-hack', is flagged as a redirector and likely serves as a gateway to download further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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/how-to-get-a-free-hat-2021-roblox-game-hack PDF link annotation
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/shirt-ash-on-roblox-free-on-shirt.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/how-to-hack-the-chat-roblox.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/how-to-hack-on-someones-roblox-account.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/triga-cheat-engine-roblox.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/free-games-to-download-like-roblox.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/free-robux-generator-unblocked.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/how-to-access-the-studio-of-a-roblox-game-hack.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/roblox-x-ray-hack-autohotkey.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/blue-boy-hack-roblox.pdfIn PDF document text
    • https://www.tiendagrouppln.com/ckfinder/userfiles/files/cb-ro-roblox-hack.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_off0000455f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x455F 25788 bytes
SHA-256: 2544afdfc9ad914ce7436d5e851efd6719b78b68a1252fa9725c48b053d110e9
font_01_sfnt_off00008142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8142 2848 bytes
SHA-256: 4737c2778a085e0cb49e73f3b054b1a71e3f40720d213b4bfda97f95a31bfbf1
font_02_sfnt_off00008b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B04 18844 bytes
SHA-256: c3c4d04280128c37206362b8bb01c6faba24ac8b487b102e86709ade2fdb7a13

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