Malicious PDF — malware analysis report

Static analysis result for SHA-256 b738c1ebab73f541…

MALICIOUS

PDF

37.5 KB Created: 2021-05-21 14:32:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4f042f88d6e4710d5ebbbb6e869c61cc SHA-1: 41eb253ba4e412044d85c7d67cf0e89a398ad2af SHA-256: b738c1ebab73f541e8918ca466add3f83dcc302663f1d66ed553cabc557ddc74
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents itself as a lure for 'Free Robux', a common tactic for phishing or malware distribution. It contains multiple embedded URLs pointing to suspicious domains, likely serving as download sites or phishing pages. The 'ML_NYX_PDF_MALICIOUS' heuristic and the 'SE_MFA_LURE' finding further indicate malicious intent, suggesting the document may attempt to harvest credentials or session tokens.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 4

  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.xyz/app/431946152/how-to-get-free-robux-2021-game-hack
    • http://domaizdereva24.ru/images/minecraft-free-android_GM479516143.pdf
    • http://domaizdereva24.ru/images/can-you-get-free-tiktok-fans_GM835599320.pdf
    • http://domaizdereva24.ru/images/roblox-hack-2021_GM431946152.pdf
    • http://domaizdereva24.ru/images/where-to-get-free-robux_GM431946152.pdf
    • http://domaizdereva24.ru/images/toolbox-for-minecraft-pe_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003497.bin
0809bbdba25368fe7385d530cb9026f1d0c7c6f0ea8b8493009f164e78ebf75a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3497 26128 bytes
font_01_sfnt_off00006fec.bin
662354714a7c4aa127b8bd681013e9d5d113fbfc5a2f5afb2d34764175bb04a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEC 18684 bytes

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