Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ff690a5834a4d0…

MALICIOUS

PDF

59.7 KB Created: 2020-11-01 04:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1e329f83337c57a9c3c72c993268b590 SHA-1: 4ad54f376c88780a575bc109eb527fcc4d9c8e7c SHA-256: e9ff690a5834a4d0b6b8504cdfbae813fe9f14b5dc3ca39abb03985ccb4e97e2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file functions as a link farm, containing numerous links to other PDF documents hosted on disposable domains. One of the embedded URLs, 'https://ggtraff.ru/123?keyword=founding+brothers+joseph+ellis+pdf', is identified as a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=founding+brothers+joseph+ellis+pdf In PDF document text
    • https://feleluxotikuko.weebly.com/uploads/1/3/4/3/134338959/d97d768a.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/335308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f872577158aa.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/1356637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5f92073a7df02.pdfIn PDF document text
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/e5738b07.pdfIn PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/fedij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5f91585e2b1ba.pdfIn PDF document text
    • https://kivofijola.weebly.com/uploads/1/3/4/3/134309380/0b2453e65eb4.pdfIn PDF document text
    • https://sikinuvozo.weebly.com/uploads/1/3/4/4/134451197/punawukufunoj.pdfIn PDF document text
    • https://wumotobu.weebly.com/uploads/1/3/4/3/134370577/6494929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423452/normal_5f9d8cf634283.pdfIn PDF document text
    • https://warakamaluxib.weebly.com/uploads/1/3/4/3/134378328/59f21c8755cae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375204/normal_5f9113bddfcdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_5f8eea7ccdca9.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/94b33fb5-1d59-460a-a8f7-ee9e1c50a4d3/56486465453.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_off0000aa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA8C 5264 bytes
SHA-256: 2ecac1b9ae9a4ba639c98748dc9492034049eca4ce9bed8be8a5d08911cc1177
font_01_sfnt_off0000bc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC73 10808 bytes
SHA-256: a1cbd57d1c71f0201e915f9db801fc3135043ac7993341adcdc5994f145ed369

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