Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b9c5ca5a496e64…

MALICIOUS

PDF

44.7 KB Created: 2021-04-29 01:29:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 90bb474e43e068f818a426db14eaa221 SHA-1: 0b1f25b87e6ef87f8627661028cd6fe3b45e451f SHA-256: 78b9c5ca5a496e64a82e6bd5ee1532ee5173bf040aede052783d913058e3a040
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 0.9863

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/hack-exploit-for-roblox-no-virus-game-hack PDF link annotation
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-robux-august.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/no-survey-anti-bots-allowed-robux-hacker.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-roblox-promotion.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-restaurant-tycoon-hack-lua-c.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-beyblade-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-kindle-fire.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/online-free-roblox-games.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-account-in-roblox-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-2021-no-survey.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-hack-no-robot-verification.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_off000042ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x42AD 26836 bytes
SHA-256: 3ed34c5b91e42744d66da8624b26d6556fc7b0d4a3c34a370d1d873c00004adc
font_01_sfnt_off000080b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80B6 2848 bytes
SHA-256: 4737c2778a085e0cb49e73f3b054b1a71e3f40720d213b4bfda97f95a31bfbf1
font_02_sfnt_off00008a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A77 19020 bytes
SHA-256: 0016fc60a5666b9c1cdd9ead8e11c6f12e75bfa277c6c69b27256c193fcb2b3b

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