Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cd991334e7cc5b…

MALICIOUS

PDF

37.4 KB Created: 2021-05-24 07:12:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fcc0a8d97c2f74641b63787b885fbc14 SHA-1: 1a83cf6fb5d4459681e8ecd2b010bd6d8e14e93d SHA-256: 27cd991334e7cc5b1e74eb5a45fdf1a480e948a8e6feeff2e5e9d92357b224ea
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 0.9447

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/roblox-hacked-com-2021-game-hack PDF link annotation
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/free-spin-coin_GM406889139.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/minecraft-windows-10-free_GM479516143.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_002_off00002ff4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FF4 27308 bytes
SHA-256: 6017feb7a4b0f319a9edd3016ed14cddbbd8c09a9c35d879bff00bbc31c4022e
font_01_sfnt_off00006e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9C 19016 bytes
SHA-256: 1bdffeea421802d48c0c5f4972bc43262882194040db90b4400103ab0d186a68

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