Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ca450353703cff…

MALICIOUS

PDF

41.8 KB Created: 2020-10-02 15:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 763d0a27bb4e5e7cef7c6ab057fc85cc SHA-1: 6d447d6f8aada4dad48b8874f514f6cbb44c7f38 SHA-256: 53ca450353703cff24689070c11644b7f6f939494f769eb42f4134303ad7d918
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it functions as a link farm on disposable hosting. The embedded URLs likely serve to lure users to malicious sites, potentially for phishing or to download further payloads.

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=martin+logan+motion+10 In PDF document text
    • http://matefusi.chinesebilingualstars.com/uploads/1/3/2/6/132696210/da1d154.pdfIn PDF document text
    • http://farefen.olathefencecompany.com/uploads/1/3/2/3/132302782/d04e42392caa8.pdfIn PDF document text
    • http://files.all-naturalchiro.com/uploads/1/3/2/7/132741020/zimiwusomujib-xulojuxe-buralizi.pdfIn PDF document text
    • https://site-1036851.mozfiles.com/files/1036851/rugolunesokimefugefiz.pdfIn PDF document text
    • http://zijutava.southlandbaptisttemple.com/uploads/1/3/1/1/131163953/7d759.pdfIn PDF document text
    • http://wugin.ausablebrewing.com/uploads/1/3/0/8/130874612/jibowi.pdfIn PDF document text
    • http://files.simixairconditionercoating.com/uploads/1/3/1/4/131408170/nuxizudevomap_famir.pdfIn PDF document text
    • http://nuxumuvir.babyg-lash.com/uploads/1/3/0/7/130775583/1617803.pdfIn PDF document text
    • https://site-1036750.mozfiles.com/files/1036750/xukipetesidiresalofarab.pdfIn PDF document text
    • https://site-1036791.mozfiles.com/files/1036791/juwewitinarez.pdfIn PDF document text
    • https://site-1040871.mozfiles.com/files/1040871/2286111805.pdfIn PDF document text
    • https://site-1036858.mozfiles.com/files/1036858/48021998821.pdfIn PDF document text
    • https://site-1036628.mozfiles.com/files/1036628/gekixububarov.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_off0000651f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651F 5024 bytes
SHA-256: bbcb6e4cd26eb5d692785403fcd3856463cf08135744b4235e6878e1cded64e3
font_01_sfnt_off0000762c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x762C 10592 bytes
SHA-256: 08642e816bc270774cc16dfa5f33cd3e4bfcbd182787c095bb41eec40974fd12

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