Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9caa9374a9b8867…

MALICIOUS

PDF

37.9 KB Created: 2021-05-22 07:18:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d49e4bb9dedde008894208fa9ae0b336 SHA-1: 1c5c495506d5577dc2afa42eec1dbaf90aba587c SHA-256: c9caa9374a9b8867356d303e42e34d03717c76fabedf2a0157ba8ca9e325a3d9
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 0.7010

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/835599320/freer-pro-tiktok-game-hack PDF link annotation
    • https://www.lwctrust.co.uk/admin/ckfinder/userfiles/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.lwctrust.co.uk/admin/ckfinder/userfiles/files/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.lwctrust.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.lwctrust.co.uk/admin/ckfinder/userfiles/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.lwctrust.co.uk/admin/ckfinder/userfiles/files/app-store-coin-master-free-spins_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_002_off00002fe4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FE4 25844 bytes
SHA-256: 988e46464d2e6a1d28c62a53cfe644b990c9826ad8d03e7d38a5afe1ad889786
font_01_sfnt_off00006ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACE 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off000074b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74B3 17612 bytes
SHA-256: ce89ed17beb43e5874c760a665d90bca09271831bf209f2f19e5d757293baf95

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