Malicious PDF — malware analysis report

Static analysis result for SHA-256 4961c7375806dd07…

MALICIOUS

PDF

43.0 KB Created: 2020-10-07 08:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: df47c78eca4c87c6339a33c10bbd5eaa SHA-1: 625b4a0f1a9b013a53eb10bbbacb83bc9f231cf9 SHA-256: 4961c7375806dd07f8c7eaff30708672220db03d69363e609235b2f8bee0e699
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this sample as malicious. The primary IOC is the redirector URL, which is likely used to host or chain to further malicious content.

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://cctraff.ru/strik?keyword=graphite+electrode+manufacturing+process+pdf In PDF document text
    • https://site-1036791.mozfiles.com/files/1036791/senuf.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/7603528392.pdfIn PDF document text
    • https://site-1039847.mozfiles.com/files/1039847/viwirejorusa.pdfIn PDF document text
    • https://site-1042349.mozfiles.com/files/1042349/82359193539.pdfIn PDF document text
    • https://site-1041090.mozfiles.com/files/1041090/tigamesepobawulilitev.pdfIn PDF document text
    • http://files.richland-baptist.org/uploads/1/3/0/7/130775907/9f333fe4f.pdfIn PDF document text
    • http://files.maryjanesedun.com/uploads/1/3/1/6/131606253/9237455.pdfIn PDF document text
    • http://files.americansinglereedsummit.com/uploads/1/3/0/8/130814633/6afd3b0c34e2.pdfIn PDF document text
    • http://files.thecryptocorp.com/uploads/1/3/1/8/131871740/1119637.pdfIn PDF document text
    • http://posuk.peterandannemariehelms.com/uploads/1/3/2/3/132303382/mobiz-bopovowikexo.pdfIn PDF document text
    • https://site-1037164.mozfiles.com/files/1037164/64551848131.pdfIn PDF document text
    • https://site-1036781.mozfiles.com/files/1036781/13254899164.pdfIn PDF document text
    • https://site-1043760.mozfiles.com/files/1043760/66314891837.pdfIn PDF document text
    • https://site-1048453.mozfiles.com/files/1048453/90240107663.pdfIn PDF document text
    • https://site-1043686.mozfiles.com/files/1043686/96677782606.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2692a55e-f68f-4df4-9c45-81b66e5a80dd/85554258820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c74a7c9-d530-4e59-83c7-d90825bfd68d/61257273858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1641fe9-3dde-4d66-8a72-b49141aecc8b/11723641845.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_off000069a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69A7 5600 bytes
SHA-256: 73e5aa97c4207f0a74cdf6fbf9daf8ad81c65ccb7b17405d1a99146d546af40f
font_01_sfnt_off00007c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C89 10016 bytes
SHA-256: 0612ef0b71d4ca468f5df9924e0ed6f60858bc0bf34a35b5664c837d6e15cc08

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