Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c40ebacf658c10c…

MALICIOUS

PDF

37.2 KB Created: 2021-05-20 15:58:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a79346ad7d77028bff11fe358b035f1e SHA-1: 5fd7b3e27b90d2c0fbe43ae18cf35b6f30a15788 SHA-256: 5c40ebacf658c10c647d4be01741b87c0e83e9e9af430746c3d39eabf0d4392a
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/479516143/how-to-make-a-modded-minecraft-server-for-free-game-hack PDF link annotation
    • http://bressanassessoria.com.br/images/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-money-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://youtuIn 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_off0000355a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x355A 25580 bytes
SHA-256: 00351c6a69eebd99000a5f2fd075c134c8087b7b9a9bcfefb4601b54703fce58
font_01_sfnt_off00006ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF3 18332 bytes
SHA-256: 59959101681fb4a2744844bcdf3902b1567deffd11dd3ddee6423be8a335a742

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