Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d63ec457f6570f…

MALICIOUS

PDF

38.7 KB Created: 2020-08-31 07:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30881163dcfdfcf1e40d16b0595717f8 SHA-1: 84cf4523d374cd9d5dde87e67cab5d49847f854d SHA-256: 73d63ec457f6570fce7af5faee15d5cb0534c5eb6d7592739196e18d86e997fd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=rosie+revere+engineer+lesson+plan'. The document body, though heavily obfuscated, also contains this URL and other benign-looking PDF links. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.com/wix?keyword=rosie+revere+engineer+lesson+plan
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/96768c_f5e33c13bf3b4062be1fe3f7e01cdeda.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_e3aa1e3620b3495fa5a2af5d52c9ac21.pdf
    • https://static.usrfiles.com/ugd/e745be_221b44012cce4e7c873e13e5eecea0d7.pdf
    • https://static.usrfiles.com/ugd/52b593_cdf9f637c5bb4ac19beb46540a6601b2.pdf
    • https://cdn.shopify.com/s/files/1/0432/2453/1101/files/wemaxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8787/8549/files/80256505336.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/24253341221.pdf
    • https://cdn.shopify.com/s/files/1/0434/2621/8134/files/battery_capacity_calculation.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052c5.bin
1b24919cb9dec0cf25edf3cb6ce2d04301daf67442eb6941dd7583148c9a0c13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52C5 5052 bytes
font_01_sfnt_off0000640b.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640B 1800 bytes
font_02_sfnt_off00006c98.bin
131d3ac4faf03d9438972a3efb7733360ce0c4348e1de9ae80c5c2a10f24a6d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C98 9864 bytes

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