Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1304a4bb0a2d2a…

MALICIOUS

PDF

37.0 KB Created: 2021-05-21 14:44:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ccb53dc658d4881c580f96be5a83fb79 SHA-1: 2b42a476d6dc4b6c3739cf72e0d2c8b731d65b40 SHA-256: 8c1304a4bb0a2d2aef7d34e5518a839772969a7bde702f7afc5571960739f8d1
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-studio-free-download-game-hack PDF link annotation
    • http://cornerstonedurham.com/images/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • http://cornerstonedurham.com/images/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cornerstonedurham.com/images/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://cornerstonedurham.com/images/roblox-speed-hack_GM431946152.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
font_00_sfnt_off00003111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3111 26640 bytes
SHA-256: d0c6a91f879db32c5b056b30c2655e7f7dedf52ad749f49c05c4569f06ce6838
font_01_sfnt_off00006cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF5 19048 bytes
SHA-256: 285731f73243192995ef55c7bff5b12d0277a9b461a1d4b1bbd56785699d0c43

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