Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19bf22a47f658d2…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 21:44:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f36d3aca74640061c61d001265046fc1 SHA-1: af9a83a1c46fdb82e046a65d80c51d33ab729954 SHA-256: b19bf22a47f658d2409ddfc03954cf88ac8d7f30cfbc319b39fbdddd5cd58ced
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 0.9980

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/406889139/how-to-get-free-cards-in-coin-master-game-hack PDF link annotation
    • http://www.yaringhospital.go.th/UserFiles/File/stain-roblox-free-shop-t-schirts_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/roblox-robux-hack-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/roblox-windows-10-hack-download_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-card-collection-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-roblox-injector_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/roblox-tracker_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/roblox-surf-hack_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/robuxian-free-robux-code-generator_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/universal-minecraft-converter-free_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/roblox-hack-account-and-password_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/roblox-kicked-by-server-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-use-roblox-cheat-engine-64_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/is-roblox-giving-away-free-robux_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-daily-free-spins-link_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_off000030bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30BF 22900 bytes
SHA-256: a9ebc0acaa1e99d7388e76e9eefb6e112be64258fead8520bb23698e3a64b103
font_01_sfnt_off0000642e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x642E 18336 bytes
SHA-256: 0d5febb0e7f1fbd8a931d90606c69d40537333425eb6ed2519c796d1765588fc

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