Malicious PDF — malware analysis report

Static analysis result for SHA-256 4439b884f6d17a4f…

MALICIOUS

PDF

33.0 KB Created: 2020-11-06 12:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 093dc72f414271f5c3028c731231d1ed SHA-1: e59cd64247cdba27035b614046179fbfb4c70189 SHA-256: 4439b884f6d17a4f26d87bb3869e832b6bc7785dfcde257bb1d7706c72b962ef
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness. The document body itself appears to be malformed or heavily obfuscated, but the presence of the URL 'https://traffmen.ru/aws?keyword=k+swiss+tubes+women' within the body suggests an attempt to direct users to potentially harmful 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 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://traffmen.ru/aws?keyword=k+swiss+tubes+women In PDF document text
    • https://purowuma.weebly.com/uploads/1/3/4/4/134472698/1b7973680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_5f8bbd2e61050.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/vawulimigun.pdfIn PDF document text
    • https://rusunesezov.weebly.com/uploads/1/3/4/3/134309606/85d95b4f0e3a1b.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/jakore_nulipurom_tumobozonob_figozulugid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377125/normal_5f8da88faf7c0.pdfIn PDF document text
    • https://xafasujogi.weebly.com/uploads/1/3/4/3/134374351/7c5b985a.pdfIn PDF document text
    • https://wusiparopebabo.weebly.com/uploads/1/3/4/5/134505529/9717301.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/roh_wrestling_roster_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/vezosoluvezoj/34386956826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45b8be02-e6a3-4063-a521-aaf4ff526bf0/23557421257.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/5th_grade_social_studies_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/showbox_pc_app_download.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_off0000462f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x462F 4696 bytes
SHA-256: e05b543c8b5886afcfd9bcb2c1b46adfb3b22ee460f5dc7b46faa98633412f82
font_01_sfnt_off0000562f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x562F 9752 bytes
SHA-256: b781ef2006cb6053b2728c2c3fb5989ad1dac82cdee73bd5ef2093b70956b19c

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