Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac76e7b5cd9d7c5…

MALICIOUS

PDF

43.4 KB Created: 2021-05-21 07:41:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 611673067f7c668bb1b3d063b9133f75 SHA-1: d12a11dc05ec9b6714fc09e7531baeec697c4995 SHA-256: 4ac76e7b5cd9d7c5adafb148fe6b7b0f109c6f8773a2a87fcedbeefae03fd9c5
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 0.9538

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/no-scam-free-robux-game-hack PDF link annotation
    • https://vstarnippers.com/images/free-robux-group_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/free-robux-games-that-actually-work_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
stream_002_off00003678.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3678 37172 bytes
SHA-256: cfc967d2962adb71d71756ce6e0dd523a31d22c83829719160c799ffd13b9b46
font_01_sfnt_off00008827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8827 18500 bytes
SHA-256: 028f53d29b1a624cb68bae5e747b7c177b5cbf8f783d4c53e2642c12f49f399d

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