Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fba3e6edda8a4ed…

MALICIOUS

PDF

38.6 KB Created: 2020-10-09 11:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d1a4b46671d9fe98425ceb0a43a1866e SHA-1: eebc4113811dbffa1cf7ea5e82f4aebc579c19eb SHA-256: 4fba3e6edda8a4ed00193d5e2610f5f2ced05984e333b99e78893d16532b2fc8
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links pointing to external PDF documents hosted on various domains, many of which appear to be disposable. The primary URL, https://gettraff.ru/strik?keyword=uglydolls+dvd+walmart, suggests a potential SEO manipulation or traffic redirection scheme. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a malicious infrastructure.

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://gettraff.ru/strik?keyword=uglydolls+dvd+walmart In PDF document text
    • http://bixekotav.bulldogcleaningandrestoration.com/uploads/1/3/1/4/131438437/6683828.pdfIn PDF document text
    • http://kidom.adjectivenewmusic.com/uploads/1/3/1/4/131407005/wawifomuranogina.pdfIn PDF document text
    • http://files.thedialgroup.org/uploads/1/3/0/7/130775491/8656910.pdfIn PDF document text
    • http://jibivos.carpetcleaningstpete.com/uploads/1/3/0/7/130738948/zikuvunowimabafasor.pdfIn PDF document text
    • http://files.mistressmorgana.com/uploads/1/3/0/7/130739895/387d902f5709bc6.pdfIn PDF document text
    • https://site-1043259.mozfiles.com/files/1043259/52729643847.pdfIn PDF document text
    • https://site-1037120.mozfiles.com/files/1037120/91315242854.pdfIn PDF document text
    • https://site-1036850.mozfiles.com/files/1036850/66820764183.pdfIn PDF document text
    • https://site-1039303.mozfiles.com/files/1039303/wuledakezinumu.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/a3f45d4b-55fb-4b7a-aa64-e4195d0f9a89/47959860635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff02674-7627-4db6-ad94-30067c1566b3/31796156957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd99c087-2f38-4918-9c9a-f5d782fd276e/47277701643.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5849/0261/files/xepul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7831/2355/files/popular_orc_last_names.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1617/4237/files/1928473989.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4393/3336/files/the_free_online_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6208/4262/files/judge_eileen_rakower_part_rules.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_off000056f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56F3 5392 bytes
SHA-256: 6556231704d606db9b39d4f6ff23514894e5dbd7366c2615a21ba4a865f68120
font_01_sfnt_off0000694d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x694D 10600 bytes
SHA-256: ea9e792414d2819cc432bf87af4e1cb700a9e1e0e4edce365620d3c765cd8a53

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