Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6aae3a507c96fd…

MALICIOUS

PDF

70.1 KB Created: 2020-11-18 21:28:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c6fc28f7f94cb91441c3477605893020 SHA-1: 91748e095a466b5105c2fb442bd9bbd7a6e4fdfa SHA-256: 1a6aae3a507c96fd8c0a405a3d54f6ab870353c82c1baa5cd35f5a6df3ef6bc6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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?utm_term=figuras+retoricas+imagenes In PDF document text
    • https://metumarexidema.weebly.com/uploads/1/3/4/5/134591821/suxirerekilosoderab.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/vakiwusi_zerarupuzapesu_zuxorivikabedok.pdfIn PDF document text
    • https://biwireteput.weebly.com/uploads/1/3/4/1/134131636/birigoxava.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/likurolarubezojo.pdfIn PDF document text
    • https://kafigibedup.weebly.com/uploads/1/3/4/4/134479504/1ab4d8da.pdfIn PDF document text
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/6598787.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/0cadb6e.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/6a63aa9e-e13f-421a-b6a7-9ec2c24f7640/pamupa.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/schlemmertopf_clay_cooker.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/blood_and_guts_trainer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5013de1d-16ae-4a6d-9249-e7212caab954/79832481714.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/emt_classes_bay_area.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9fda25-d146-40ef-a4f5-482672526cc8/mitizakodufuvuforedop.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/attestation_d_hbergement_parents.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_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 5044 bytes
SHA-256: 601b242d180c8dbb67c8e11a70850a8800a5abefcb7e1eeb8bf4853e0a00fe6c
font_01_sfnt_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 11044 bytes
SHA-256: 1e66c09c76b90d06f28c46c384959497d029a2166a645dc739ed52ec10ec6721