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) First seen: 2020-09-24
MD5: 73cb675b5bf3a76c656fdf56da88dc92 SHA-1: db0b3a93ac570c4b68b6143e6e715fec1c24fd7e SHA-256: 1783f685b36e5d54220958ad3dbf76f31884e895e2d3e5ff693fb8b66a1d807a
184 Risk Score

Malware Insights

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

This PDF document contains numerous links to external PDF files, a common tactic for SEO link farms and potentially distributing malicious content. One of the embedded URLs, 'https://ttraff.cc/wb?keyword=behaviour%20management%20pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document's content appears to be a lure, directing users to potentially harmful infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 In PDF document text
    • http://files.publichealthmuseum.org/uploads/1/3/1/3/131384789/a826b1b39.pdfIn PDF document text
    • http://files.behavinglively.org/uploads/1/3/2/6/132683088/kebadaxibapamite.pdfIn PDF document text
    • http://files.2portageesproductions.com/uploads/1/3/0/7/130738501/zifanafesibi.pdfIn PDF document text
    • http://files.srrlsf.com/uploads/1/3/1/3/131380868/4f04903295aa5.pdfIn PDF document text
    • http://files.villa-anggrek.com/uploads/1/3/1/3/131379371/difisudenaborex.pdfIn PDF document text
    • http://files.babsonwrfc.com/uploads/1/3/0/7/130775511/3b91b6.pdfIn PDF document text
    • http://files.body-knowledge.com/uploads/1/3/2/6/132681824/2094315.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://siruzewi.files.wordpress.com/2020/06/17145288768.pdfIn PDF document text
    • https://jozenomo.files.wordpress.com/2020/06/66894919015.pdfIn PDF document text
    • https://vibikiwag.files.wordpress.com/2020/07/95091354974.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6409 5236 bytes
SHA-256: fb10ec80cda69cc151ad8e058bb741309982fc6cccfbfbc8c7dca73a83dd9a55
font_01_sfnt_off000075b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75B6 11916 bytes
SHA-256: 5dbd6787c9c30747dc224a26c334586871dae495c7d62aaf261d954a25c47f99