Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fde9eba4be274a3…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 17:03:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9994d2512bc5e58ba0fadb783eabb9c9 SHA-1: deb7071e99d1850be9b136f1ffa61695cae3b05a SHA-256: 4fde9eba4be274a31c4a7b47caf249ee702fad6232ab07f95004e020008e6c56
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-roblox-money-game-hack PDF link annotation
    • https://www.nonglong.go.th/ddd/UserFiles/File/hack-week-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/a-old-roblox-account-free_GM431946152.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/roblox-hack-forums_GM431946152.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/spin-coin_GM406889139.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/coin-master-link-app_GM406889139.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/como-conseguir-robux-gratis-sin-hacks-con-dos-links_GM431946152.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/block-best-robux_GM431946152.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/hectic-plays-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/coin-master-link-today_GM406889139.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/roblox-guess-that-character-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/how-to-get-free-robux-on-mac-2021_GM431946152.pdfIn PDF document text
    • https://www.nonglong.go.th/ddd/UserFiles/File/get-free-robux-gg_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
font_00_sfnt_off00003025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3025 22092 bytes
SHA-256: f2599c072a81fb6612508eab8b4f4d106748d5742e46ea652a1211613501ac90
font_01_sfnt_off00006140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6140 19028 bytes
SHA-256: 286b45bdd8f766aa386658715904d42a258412499d5ccea6d2527f33b9debf2d

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