Malicious PDF — malware analysis report

Static analysis result for SHA-256 6831948781763f3f…

MALICIOUS

PDF

33.5 KB Created: 2021-07-20 21:14:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e7d0cd07df0f88c670898716a4891d02 SHA-1: 15e0dd68f4a77a9c429dd2e66f1871a0995b0484 SHA-256: 6831948781763f3fd4925cff3fb516046f96be66c6efc0fa6a207cf8be7a8dd3
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 0.9942

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 http://netcdn.tw/app/431946152/free-robux-games-that-actually-work-2021-game-hack PDF link annotation
    • https://satsco.com.vn/wp-content/uploads/fsqm-files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://satsco.com.vn/wp-content/uploads/fsqm-files/free-likes-for-tiktok_GM835599320.pdfIn PDF document text
    • https://satsco.com.vn/wp-content/uploads/fsqm-files/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • https://satsco.com.vn/wp-content/uploads/fsqm-files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://satsco.com.vn/wp-content/uploads/fsqm-files/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://satsco.com.vn/wp-content/uploads/fsqm-files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://satsco.com.vn/wp-content/uploads/fsqm-files/free-robux-real_GM431946152.pdfIn PDF document text
    • https://satsco.com.vn/wp-content/uploads/fsqm-files/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://satsco.com.vn/wp-content/uploads/fsqm-files/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://satsco.com.vn/wp-content/uploads/fsqm-files/free-spin-link-for-coin-master_GM406889139.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_off0000288f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x288F 22804 bytes
SHA-256: 3a831302e098cc245a78f2d65154906274b869e147927affab5b1f2f88b0669f
font_01_sfnt_off00005bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB8 19980 bytes
SHA-256: c5a26cb5107a04c6f1ee35fb00bfc17e87ec921a407127f2def7e928c8550b77

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