Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b3c171090e8c87…

MALICIOUS

PDF

44.1 KB Created: 2020-10-02 23:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1b274ef5ea97e6f451b352911e9ca821 SHA-1: 8740598c993b4bacd5318f910f4a08cf5c2b38d5 SHA-256: b1b3c171090e8c870e54f4f6d5ac9370daf3d46810d3d3da2f3ad78b6162319e
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known redirectors, indicating a link farm or SEO poisoning attempt. The primary malicious URL identified is https://cctraff.ru/strik?keyword=branding+company+portfolio+pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to these URLs, suggesting the intent is to drive traffic to malicious sites.

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=branding+company+portfolio+pdf In PDF document text
    • https://site-1037037.mozfiles.com/files/1037037/53522727651.pdfIn PDF document text
    • https://site-1037222.mozfiles.com/files/1037222/zutajozetepufafomibixu.pdfIn PDF document text
    • https://site-1036993.mozfiles.com/files/1036993/nipuxakeduna.pdfIn PDF document text
    • https://site-1036823.mozfiles.com/files/1036823/88049871441.pdfIn PDF document text
    • http://files.scunthorpecoopjuniorchoir.org.uk/uploads/1/3/1/6/131637313/norine-gasekajipoka.pdfIn PDF document text
    • http://files.crossfirerec.com/uploads/1/3/0/7/130739020/lugotedarov.pdfIn PDF document text
    • http://files.mysunshinerides.com/uploads/1/3/2/8/132814279/katozipigadikorinap.pdfIn PDF document text
    • http://navazaxik.moagunworks.com/uploads/1/3/1/3/131398367/2106789.pdfIn PDF document text
    • http://sodaguwa.csroyalty.com/uploads/1/3/0/7/130776299/4575636.pdfIn PDF document text
    • http://xuzofa.millenniumcleaning.net/uploads/1/3/0/8/130814340/4590086.pdfIn PDF document text
    • http://files.themauricejonesagency.com/uploads/1/3/1/6/131607208/niporevixuxetewe.pdfIn PDF document text
    • http://jizefiw.amandajeane.com/uploads/1/3/1/4/131453723/gopawabetaposar-vutosedawig.pdfIn PDF document text
    • http://files.powerandposition.com/uploads/1/3/0/7/130738620/sekesofuwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F47 5448 bytes
SHA-256: 793d26b0284deb0f5e96ebf204f3d470f594b4a85f65e0773763ea58547c33d2
font_01_sfnt_off000081cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81CD 9888 bytes
SHA-256: 411c6d27424a422475c14377b731391f8d77fbb6a267eea7b98ff04c98fe6fc2

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