Malicious PDF — malware analysis report

Static analysis result for SHA-256 1783f685b36e5d54…

MALICIOUS

PDF

42.1 KB Created: 2020-07-08 13:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73cb675b5bf3a76c656fdf56da88dc92 SHA-1: db0b3a93ac570c4b68b6143e6e715fec1c24fd7e SHA-256: 1783f685b36e5d54220958ad3dbf76f31884e895e2d3e5ff693fb8b66a1d807a
154 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://ttraff.cc/wb?keyword=behaviour%20management%20pdf`. The document body, though partially obfuscated, also contains this URL and other links to PDF files hosted on various domains, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.cc/wb?keyword=behaviour%20management%20pdf
    • http://files.publichealthmuseum.org/uploads/1/3/1/3/131384789/a826b1b39.pdf
    • http://files.behavinglively.org/uploads/1/3/2/6/132683088/kebadaxibapamite.pdf
    • http://files.2portageesproductions.com/uploads/1/3/0/7/130738501/zifanafesibi.pdf
    • http://files.srrlsf.com/uploads/1/3/1/3/131380868/4f04903295aa5.pdf
    • http://files.villa-anggrek.com/uploads/1/3/1/3/131379371/difisudenaborex.pdf
    • http://files.babsonwrfc.com/uploads/1/3/0/7/130775511/3b91b6.pdf
    • http://files.body-knowledge.com/uploads/1/3/2/6/132681824/2094315.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://siruzewi.files.wordpress.com/2020/06/17145288768.pdf
    • https://jozenomo.files.wordpress.com/2020/06/66894919015.pdf
    • https://vibikiwag.files.wordpress.com/2020/07/95091354974.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006409.bin
fb10ec80cda69cc151ad8e058bb741309982fc6cccfbfbc8c7dca73a83dd9a55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6409 5236 bytes
font_01_sfnt_off000075b6.bin
5dbd6787c9c30747dc224a26c334586871dae495c7d62aaf261d954a25c47f99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B6 11916 bytes

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