Malicious PDF — malware analysis report

Static analysis result for SHA-256 af08d7a1a84cd988…

MALICIOUS

PDF

40.5 KB Created: 2020-10-02 15:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 20a97be9b7866357ecd6100ca44084d2 SHA-1: efd442690bceda182ceac0238bb609de076cc98a SHA-256: af08d7a1a84cd9881b986ecd7b376e59edb39cfe348d8c73ddc221f9c47ad210
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically identified as a known malicious redirector. The document body, though partially corrupted, includes URLs that appear to be part of a link farm hosted on disposable domains. This suggests the primary goal is to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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 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://gettraff.ru/strik?keyword=planches+ma%25C3%25A7onniques+des+hauts+grade In PDF document text
    • http://files.waggawaggaprobus.waggamatters.com/uploads/1/3/0/7/130740186/mobufo.pdfIn PDF document text
    • http://wijozoso.pembrokeshirenaturalburials.co.uk/uploads/1/3/0/8/130813554/3522607.pdfIn PDF document text
    • http://files.foundationschristianschool.com/uploads/1/3/0/9/130969525/kefeme.pdfIn PDF document text
    • http://files.warren-curry.com/uploads/1/3/1/3/131383475/tizowawumakilaxi.pdfIn PDF document text
    • http://files.eswub.com/uploads/1/3/1/0/131070523/186f627.pdfIn PDF document text
    • https://site-1039215.mozfiles.com/files/1039215/wijifomaw.pdfIn PDF document text
    • https://site-1039624.mozfiles.com/files/1039624/18932329475.pdfIn PDF document text
    • https://site-1036926.mozfiles.com/files/1036926/lelidixawoxufovexudavez.pdfIn PDF document text
    • https://site-1038421.mozfiles.com/files/1038421/21028994538.pdfIn PDF document text
    • https://site-1039719.mozfiles.com/files/1039719/saloginezavelajoxikut.pdfIn PDF document text
    • https://site-1036977.mozfiles.com/files/1036977/jupuraxejoramosu.pdfIn PDF document text
    • https://site-1039496.mozfiles.com/files/1039496/77853296729.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4234/6907/files/lixuki.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_off00005afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AFD 5660 bytes
SHA-256: b49f6f20f68a7c84c256299b647f256872baa500f3713b27f794f58052dbc721
font_01_sfnt_off00006dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBD 12092 bytes
SHA-256: 3493730c9aaad651ee49daa71c7e96463595a9f7d5f1061b84b7284ff6d87f4d

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