Malicious PDF — malware analysis report

Static analysis result for SHA-256 797c471fc74db663…

MALICIOUS

PDF

42.6 KB Created: 2020-06-08 04:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c59f3fd393e9315d4ae481c0db44f247 SHA-1: e70228a7b5307753779ee5ad2687d7bf039b6df5 SHA-256: 797c471fc74db6632bc8599b5f84928d642f6772aa216899d9367ba6b9fe6689
184 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body is obfuscated but contains a URL that appears to be part of this redirection scheme. The ML classifier also strongly indicated maliciousness.

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.com/wp3?keyword=introduction+to+trees+in+data+structure+pdf#introduction+to+trees+in+data+structure+pdf In PDF document text
    • http://pat1.org/uploads/1/3/0/4/130477039/6873325.pdfIn PDF document text
    • http://mail.biofattoria.net/uploads/1/3/0/6/130620567/botesaro_jadebisu_xunuf.pdfIn PDF document text
    • http://trainupchildren.com/uploads/1/3/0/3/130313698/wesavaremon.pdfIn PDF document text
    • http://mta-sts.mail.gunnsd.com/uploads/1/3/0/5/130539940/wejawas-gijari-mibofin.pdfIn PDF document text
    • http://giannaramon.com/uploads/1/3/0/2/130291449/9f78e78f4c.pdfIn PDF document text
    • http://hayworthgardens.org/uploads/1/3/1/4/131407552/6197963.pdfIn PDF document text
    • http://aerofodder.net/uploads/1/3/1/3/131397981/1324b5476a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tamuvonitu.files.wordpress.com/2020/06/lovulawuvuwuribesoni.pdfIn PDF document text
    • https://xagixamowow.files.wordpress.com/2020/06/pefusejanowezuwurij.pdfIn PDF document text
    • https://tofogaba.files.wordpress.com/2020/06/63978854054.pdfIn PDF document text
    • https://xuzetepevot.files.wordpress.com/2020/06/zizezomoguwozu.pdfIn PDF document text
    • https://berilin.files.wordpress.com/2020/06/98878291620.pdfIn PDF document text
    • https://dakisil.files.wordpress.com/2020/06/kalapegefidofewusip.pdfIn PDF document text
    • https://jilatuwim.files.wordpress.com/2020/06/76147895406.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B56 10272 bytes
SHA-256: f962f696e9956b556d1b9ee837c9d854fcbe0ea8603a3d763d70db045676f127

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