Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85ff1e90a52308c…

MALICIOUS

PDF

57.5 KB Created: 2020-11-04 09:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4e71cb69581c38201b12a6f64ab91ae9 SHA-1: 9771a4bfa2bd2ad6faa627a4a9103769234ec43a SHA-256: c85ff1e90a52308c0232f529b6ae0c12f11dacfd2e431a8a43a1d98285e7d227
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm on disposable hosting further supports malicious intent. The document body itself appears to be obfuscated or corrupted, but it does contain the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ggtraff.ru/123?keyword=cool+math+games+strike+force+heroes+2 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5f94889f89175.pdfIn PDF document text
    • https://pavofadibap.weebly.com/uploads/1/3/4/3/134370944/muborifewujilum-fugumedawefif-wefonadisar-jenimijirev.pdfIn PDF document text
    • https://rirumuzog.weebly.com/uploads/1/3/4/1/134109041/midufuga.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/38a132384da.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/9090229.pdfIn PDF document text
    • https://xififaxapid.weebly.com/uploads/1/3/4/3/134344339/9216419.pdfIn PDF document text
    • https://nopirirog.weebly.com/uploads/1/3/4/2/134234714/zobuxavalafarof.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/9ad70242-0a21-474a-96a6-86ab5272cc29/wow_vanilla_holy_priest_talents.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/body_cavities_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/resurrection_church_evansville.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f0c029-adf0-4ff9-9453-d4bd3b255c2f/cuisinart_360_griddle_cooking_center.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ee70e3-bc40-4413-9ca5-51aba0a1c2d2/96657487583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f436127-4504-42e2-9582-eb75f9d58d90/lejuzan.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68CF 5396 bytes
SHA-256: 29b45bb7da45b5a9e4a512bf50c3fa9bca7e2b715f9431a19b54eef9831a3ce2
font_01_sfnt_off00007af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF4 11712 bytes
SHA-256: 752827c3fe7e8152bb9737574981064857611026a335aea9653e6563d3b6f49b
font_02_sfnt_off00009efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EFE 10704 bytes
SHA-256: 195b1412b08319d81da25766b52622667205b8dc2e55aa26cab6a54113a28dd7
font_03_sfnt_off0000c3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A1 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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