Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea843814202f488…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 15:20:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 85ecb31acfb0ece83ddf327f0f7e0504 SHA-1: ed98ba3beff4db70e5f83d0e53222e749adc20c9 SHA-256: fea843814202f488b4f9ad3ef63f4540b5115b01e8ba3ee092c96b063e4471cf
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a high-confidence heuristic firing for a 'free generator / game hack' lure, directly linking to the URL http://netcdn.tw/app/431946152/robux-free-online-game-hack. This URL is presented as a call-to-action within the document body, suggesting a phishing or scam attempt to trick users into visiting a potentially malicious site. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/robux-free-online-game-hack PDF link annotation
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/buy-tiktok-likes-free_GM835599320.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/free-robux-2021-roblox_GM431946152.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/how-to-hack-peoples-roblox-account_GM431946152.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/coin-master-free-spins-iphone-2021_GM406889139.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/how-to-use-cheat-engine-on-roblox-swordburst2_GM431946152.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/free-robux-download_GM431946152.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/real-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/does-cheat-engine-inject-scripts-into-roblox_GM431946152.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://assets.dpt.go.th/dptda/ckfinder/userfiles/files/free-coins-and-spins-for-coin-master-game_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_off00002fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB0 22016 bytes
SHA-256: a18feba69fc77c90522ea2f47c26b2b417b59d9f92408ce1ddcb196ccff0996d
font_01_sfnt_off00006045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6045 18912 bytes
SHA-256: ff36d619ce8e62cd296b26c96b34fbe88819c62effb096e20d6751b4628d3f13

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