Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d7beb3f1886457…

MALICIOUS

PDF

37.2 KB Created: 2021-05-22 13:37:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f3c1a8a6d5d81a210f972b9f030a4cd7 SHA-1: 41b2f93ce502229b36b4def2070751645ace0895 SHA-256: b8d7beb3f1886457f25d1136c22415505394ba3096aefdc8ae85bcbbbe7531ce
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/406889139/coin-master-hacks-game-hack PDF link annotation
    • https://belixconstructions.com.au/images/fb-coin-master_GM406889139.pdfIn PDF document text
    • https://belixconstructions.com.au/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://belixconstructions.com.au/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://belixconstructions.com.au/images/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • https://belixconstructions.com.au/images/earn-robux-com_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_off000035e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35E9 26320 bytes
SHA-256: 67fce1ff34e93a59990ebc5b76be9d41a938b6cb41fd67e91b973ab7f0c0b768
font_01_sfnt_off000071a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A2 17716 bytes
SHA-256: c15a8689411d8cca9ab0759ab4c496fe9b4353d676dd738e300719e9588112ed

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