Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26464f82e1d39fa…

MALICIOUS

PDF

42.7 KB Created: 2020-08-28 14:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1d014a4985533d04f30ebac28103511 SHA-1: a9e1289562c902a04bbecd4ab32f23d7c8835b35 SHA-256: c26464f82e1d39faba71d850b0bd1d50c8be6f0b745da3c1039ec986847e91c0
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=arrimo+de+fam%25C3%25ADlia'. The document body, though heavily obfuscated, also contains this URL and other links, suggesting a lure to a malicious site. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy. No scripts were extracted, and the PDF structure itself is the primary vector for the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.
  • 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/pify?keyword=arrimo+de+fam%25C3%25ADlia
    • http://files.robertwilliamwhitby.com/uploads/1/3/0/8/130874317/1613865.pdf
    • http://files.decatn.org/uploads/1/3/0/7/130739095/morizewi.pdf
    • https://cdn.shopify.com/s/files/1/0461/7705/8979/files/blank_spelling_test_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kilezibuvi.pdf
    • https://cdn.shopify.com/s/files/1/0439/2235/8427/files/14076958449.pdf
    • https://cdn.shopify.com/s/files/1/0448/9101/3275/files/calendario_escolar_2020_a_2020_sep.pdf
    • https://cdn.shopify.com/s/files/1/0436/0224/7838/files/kerawogetivajotodafusow.pdf
    • https://cdn.shopify.com/s/files/1/0437/2578/3190/files/molutorarapesusoxekubilif.pdf
    • https://cdn.shopify.com/s/files/1/0437/8466/7297/files/bopasudat.pdf
    • https://cdn.shopify.com/s/files/1/0432/5838/0450/files/39509933999.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068f0.bin
3f22c1ff4d058ef4234c8dc5463520c48cd3ef564beda3836f0c1f0fd8498c87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F0 4916 bytes
font_01_sfnt_off00007996.bin
806ae347f092ee2c8501c81859a4a74e6d55e451d07019f79178489f3d804c30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7996 11624 bytes

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