Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e90129080ce0a10…

MALICIOUS

PDF

43.7 KB Created: 2020-10-01 06:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b23074eab5f5e129b59e236734de7d9b SHA-1: 28df7d99d96146176eba2ee3ab157e117a647ff0 SHA-256: 8e90129080ce0a10f96b3a2536e178f38f967318937392f324fe479fa74d92d2
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one specifically to a known malicious redirector. This indicates a link farm or SEO poisoning attack designed to drive traffic to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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://cctraff.ru/strik?keyword=affective+commitment+scale+pdf In PDF document text
    • https://site-1039294.mozfiles.com/files/1039294/94899138350.pdfIn PDF document text
    • https://site-1036835.mozfiles.com/files/1036835/pidakazegixasajijezal.pdfIn PDF document text
    • https://site-1037079.mozfiles.com/files/1037079/texafivowul.pdfIn PDF document text
    • http://najit.msqg.org/uploads/1/3/1/8/131871721/4995849.pdfIn PDF document text
    • http://files.tribetasrc.com/uploads/1/3/1/4/131437676/2550493.pdfIn PDF document text
    • http://noxokan.thegrassyknollfarm.com/uploads/1/3/1/8/131856655/gobituboxusizorogobo.pdfIn PDF document text
    • http://files.ambientandcompany.com/uploads/1/3/1/4/131407734/derefilak.pdfIn PDF document text
    • http://files.setoncrusaderscyo.org/uploads/1/3/0/7/130774962/5233969.pdfIn PDF document text
    • https://site-1036835.mozfiles.com/files/1036835/bumikofaxojepufudegubu.pdfIn PDF document text
    • https://site-1039624.mozfiles.com/files/1039624/mudube.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/2cf5ee6d-9dff-4a92-8c62-6ea06c24e2c9/virexoralilode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e2ae67-4c8d-45ed-b6cf-8fd4c3fba9ab/56568543305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/190f554a-a2c8-4c65-af3c-9276a86c6392/3516348559.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_off00006d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7E 5252 bytes
SHA-256: 967fd87a890e481fdb279f25f772039525b740e015b0fdcbcca725c1645e5d2b
font_01_sfnt_off00007f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5C 10144 bytes
SHA-256: 86c9b98445e98ede517b940393d8a4356a5a29a1bc598fa9a1f01e54dd50fc5a

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