Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bac589c79b55fd…

MALICIOUS

PDF

42.3 KB Created: 2020-10-09 19:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 26b2ee915aa795ce268cf7f650576679 SHA-1: c17586cf8229b05ee4008202c01aa49c64e09888 SHA-256: 75bac589c79b55fdd67e2477b2ad0b5644ab3840915001b95b389d39a424890d
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm designed to distribute traffic. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead users to malicious content or phishing sites. The ML classifier also strongly flagged this PDF as malicious.

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=showtime+rotisserie+pork+loin+recipes In PDF document text
    • http://fubivare.skateteamindy.com/uploads/1/3/2/3/132303093/f6d1d9cb9afd4be.pdfIn PDF document text
    • http://files.greatalaskanshirtco.com/uploads/1/3/1/3/131398225/5342082.pdfIn PDF document text
    • http://files.mvireland.org/uploads/1/3/0/8/130874328/vomefupeb.pdfIn PDF document text
    • http://jijudizo.ipsinsuranceservices.com/uploads/1/3/1/3/131383314/kanuwujanopes.pdfIn PDF document text
    • http://files.masonmansungkang.com/uploads/1/3/0/7/130775176/texojirelupedutus.pdfIn PDF document text
    • https://site-1037081.mozfiles.com/files/1037081/32274082324.pdfIn PDF document text
    • https://site-1037914.mozfiles.com/files/1037914/fekadeji.pdfIn PDF document text
    • https://site-1037172.mozfiles.com/files/1037172/govitumizutedapuxuja.pdfIn PDF document text
    • https://site-1037878.mozfiles.com/files/1037878/salefafekukozaza.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/e5eb7a09-a82e-4ec6-a03b-2ed37f72083f/pepib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d45634cc-ffb0-4390-a12d-ab104ee21495/xidudinopedum.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_off00006712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6712 5220 bytes
SHA-256: f3a8506f97f83d5a128743c34cbb0ebf25ca41a8806f1cc0db88c80a157f171e
font_01_sfnt_off000078c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78C2 10568 bytes
SHA-256: 809e08f514192ee0ad376352ede991961e5e7f12b00d55626106364eaf68c843

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