Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabfc7b13447495b…

MALICIOUS

PDF

44.0 KB Created: 2021-06-07 16:43:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 24b5ef253d5f3068542156e1cba73906 SHA-1: 51b15359fa0b4dd5003a33c9dd8ab4a9607d9296 SHA-256: dabfc7b13447495b2ac1a529a112a95e9dcd287bf0f6a0e84ce4d9b178567254
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a call-to-action phrase, strongly suggesting a phishing or scam attempt. The primary lure is 'Free Robux', a common theme in gaming-related scams. The document's structure and the presence of many external links indicate it's part of a link farm designed to redirect users to potentially malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/431946152/free-robux-game-code-game-hack PDF link annotation
    • http://huounaixunghe.com/images/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/real-robux-hacks_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://huounaixunghe.com/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/roblox-character-free_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-spins-coin-master-2021-today_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
stream_004_off00004e62.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E62 25132 bytes
SHA-256: f332fc18e8879b8169935a00007899dca55152158d85675a36bfaaf8ff896822
font_01_sfnt_off0000881f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x881F 18676 bytes
SHA-256: 9a124ad1ae80bfd4b716b0bc2546073fefb11f672f745b0aee4428f24d344ad1

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