Malicious PDF — malware analysis report

Static analysis result for SHA-256 550102659a7128e5…

MALICIOUS

PDF

42.1 KB Created: 2020-09-30 05:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 663db276a00c127bd2b9f02fd28cfb8b SHA-1: b56c6d5c9540a495a94cd3b0323d312dd180f1a3 SHA-256: 550102659a7128e5319c01843f8c79486874dbc45cdcf30a7de18b18e9ea886d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure or potentially part of a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, suggesting a coordinated effort to redirect users to malicious sites.

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://ggtraff.ru/strik?keyword=energy+storage+technologies+and+applications+pdf In PDF document text
    • http://mekamu.jeffdunntrombone.com/uploads/1/3/0/7/130739860/robakexaj_nidiza_vibibuwopujoke.pdfIn PDF document text
    • http://lojoduge.soultreeevolution.com/uploads/1/3/0/8/130873995/198468.pdfIn PDF document text
    • http://ludokavel.prestigeholdingllc.com/uploads/1/3/1/0/131070382/1453635.pdfIn PDF document text
    • http://files.howtobookaholiday.com/uploads/1/3/1/4/131438216/nolodape.pdfIn PDF document text
    • https://site-1036807.mozfiles.com/files/1036807/vupodijixerajajegopege.pdfIn PDF document text
    • https://site-1037149.mozfiles.com/files/1037149/39429402670.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/11b65561-5c3e-45f2-8d06-0b9b90866179/91599278903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/879b38c0-cf79-49c6-9c56-5268a405f915/duwib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1465a3f6-4e58-46c5-9e10-a56e367e17eb/vowozisavozifuwexojuxexav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4501ff00-5a47-41f9-97e6-e98c6a7666b1/97058321863.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_off0000661e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x661E 5476 bytes
SHA-256: f12f82fdc144543b19c85ea0256debf5d9e76cf9580f25ad85086d4cf0d020fe
font_01_sfnt_off000078c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78C9 10172 bytes
SHA-256: 85f48792c4a7e79c9d1eb20e6f4104cebb4d6b9783488aaf2dc4219c1cdb9f6e

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