Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4720256f5606ab…

MALICIOUS

PDF

42.7 KB Created: 2020-11-04 04:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 907b0d1da0433e5d34c68d29d4195cc9 SHA-1: c386c7f42f6bef4828e01c3ac33f3212542d9a60 SHA-256: 6e4720256f5606aba43ea18acb887d818f982167ec6949c7a1f644a8d3bbc763
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to drive traffic to malicious infrastructure.

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://cctraff.ru/strik?keyword=written+cda+competency+statements+1-6 In PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/zotezit-nabeduratavos-lumut.pdfIn PDF document text
    • https://gemefakopegixi.weebly.com/uploads/1/3/4/3/134309359/tadalore.pdfIn PDF document text
    • https://vijativu.weebly.com/uploads/1/3/4/5/134597759/83e38a75d0f17.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/bf97e0a0-511e-4cbf-86b9-1b4816a25a06/domains_of_dread.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/download_apk_showbox.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/xubat.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/apraz_bula.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/savage_worlds_character_sheet_printer_friendly.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/dijozefuguzujazonikanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6536cd0-d7db-4c88-87c2-4f19328f392f/arriba_6th_edition_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/53952526507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be8c9ebc-4ebd-4b01-b38d-bbc02bf97adf/jiwoxuv.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/bumulek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47fe3fd1-d9c7-4c6a-9ecc-0a2d6e1dc817/89404239496.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/angielski_w_tumaczeniach_business_chomikuj.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_off000067ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67AB 5540 bytes
SHA-256: 820645742fb2f2c975066ccbf15986fcc127ab10f279963bf40243c1d9130171
font_01_sfnt_off00007a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8C 10428 bytes
SHA-256: 01f86a3d8fd21bf66d6a57e3df0ee8d643f6ea435c5a68d3b9ffedba6017aeb7

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