Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3d27502b40a0b6…

MALICIOUS

PDF

41.4 KB Created: 2020-10-07 07:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: aad2326748673842f29b04fb925193c1 SHA-1: 5ed785a35ca3bc0f996d204cd0b8d59d73ac314a SHA-256: cd3d27502b40a0b6f8e945aee8b9c8042574ed8902255aa3677f8cabc5b4ae51
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with one identified as a known malicious redirector. The document body itself is heavily obfuscated and contains a URL that points to a link farm hosted on disposable infrastructure. This suggests the primary purpose is to lure users to external sites, likely for phishing or malware delivery.

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://ggtraff.ru/strik?keyword=%25C3%25A9valuation+technologie+6%25C3%25A8me+les+familles+de+mat%25C3%25A9riaux In PDF document text
    • http://butakajan.create218.org/uploads/1/3/1/8/131857243/tinubunelavo-sirimovubazawad.pdfIn PDF document text
    • http://files.raydickaty.com/uploads/1/3/1/4/131407539/9390444.pdfIn PDF document text
    • http://sofogez.tlccasolafarms.com/uploads/1/3/1/3/131379730/8438514.pdfIn PDF document text
    • http://zezigeg.gurtons.com/uploads/1/3/2/7/132712435/bakixinok-piniran-mubifedu.pdfIn PDF document text
    • http://files.vistafairbanks.org/uploads/1/3/0/7/130739949/doterajakirepoxor.pdfIn PDF document text
    • http://files.sjuartdesign.com/uploads/1/3/1/6/131606087/wulixakitanajukaf.pdfIn PDF document text
    • http://files.stephaniesaywell.com/uploads/1/3/1/4/131454255/2142802.pdfIn PDF document text
    • http://zagoxiz.dyvepoolco.com/uploads/1/3/1/4/131407222/3613078.pdfIn PDF document text
    • https://site-1045368.mozfiles.com/files/1045368/wefivezisenovan.pdfIn PDF document text
    • https://site-1036946.mozfiles.com/files/1036946/98678024854.pdfIn PDF document text
    • https://site-1038820.mozfiles.com/files/1038820/wazejesalaxoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D14 5980 bytes
SHA-256: 9bbcd909e451786eee60c32c458e3de941af68633f95ac53016aea2cddc745ce
font_01_sfnt_off000070b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70B6 11732 bytes
SHA-256: c8e6aedbdbf521203aac8e5dd8f5e1093e781f6ed914dd7cd542277e6bc23c7f

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