Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffe866c981a190e…

MALICIOUS

PDF

38.2 KB Created: 2020-10-01 03:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f1765a7ac4d0692b1f9dfb1e75989914 SHA-1: e4101ea67c92550a79d975564a386dbd6a6f48f6 SHA-256: 5ffe866c981a190ecb0de5f7815ce426493e223e93848eb2629767c4e68bff58
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection tactic. One of the primary embedded URLs, https://ggtraff.ru/strik?keyword=catalogo+sat+pdf, is flagged as a malicious redirector. The document body text, though heavily obfuscated, contains references to this URL and other benign-looking PDF links, likely to create a deceptive appearance. The ML classifier also strongly indicated maliciousness.

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=catalogo+sat+pdf In PDF document text
    • https://site-1036754.mozfiles.com/files/1036754/wifovuk.pdfIn PDF document text
    • http://files.bertleffel.com/uploads/1/3/1/4/131437889/dilanefisusixuku.pdfIn PDF document text
    • http://zomep.dubboanglicanchurch.org/uploads/1/3/0/7/130739232/3971656.pdfIn PDF document text
    • http://files.spiritatwork.us/uploads/1/3/1/4/131438523/zuvopa-wotalurirokab-kuboxedabube-gujuwoxa.pdfIn PDF document text
    • http://files.embracingspirit.net/uploads/1/3/0/7/130740221/mirinuv_kagawulif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6544/9365/files/ansys_cfx_documentation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5696/3479/files/tadifelakiruwapuvarig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3127/3370/files/xowojom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7073369-64fa-4723-89d0-9969fc7b8dd2/zuketusevinuwox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bafa8e95-99ac-48ad-8854-e86f16830ab5/vibotazegizifobataji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e99d68-71c0-4c1a-9a0f-ef0d19c032e7/zizewojoraginojadeteba.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_off0000585d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x585D 5020 bytes
SHA-256: bc48393689ae606ecaf7ed725ad4d75fe5204713974f4a427a0299cc384d1455
font_01_sfnt_off00006988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6988 10304 bytes
SHA-256: 81f35cfa486cd95c42c12586f4403d49aee497f4444196db8947350eec218b17

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