Malicious PDF — malware analysis report

Static analysis result for SHA-256 e582e7cfa5a49ea4…

MALICIOUS

PDF

51.8 KB Created: 2020-10-02 13:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5c3a7c84fed58ef8005b82e70469653d SHA-1: 5075cd30bcd82d1b5c8eecea6d08bbb3ad5c0430 SHA-256: e582e7cfa5a49ea4d8d82d2034c9e6b143a1c448736f460f0ba1b3fe176088ae
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of external links, forming a link farm on disposable hosting. One of these links, https://cctraff.ru/strik?keyword=bdo+accuracy+for+pve, redirects to known malicious infrastructure. This suggests the document is designed to lure users to malicious sites, likely for phishing or other malicious activities.

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=bdo+accuracy+for+pve In PDF document text
    • https://site-1036971.mozfiles.com/files/1036971/93157697504.pdfIn PDF document text
    • https://site-1036680.mozfiles.com/files/1036680/75836802700.pdfIn PDF document text
    • https://site-1036760.mozfiles.com/files/1036760/ronezozo.pdfIn PDF document text
    • http://files.chilternharriers.com/uploads/1/3/0/7/130776769/4466967.pdfIn PDF document text
    • http://files.iheartbookpublishing.com/uploads/1/3/1/3/131383760/582368.pdfIn PDF document text
    • http://kobal.aggressivehomeinspection.com/uploads/1/3/0/8/130814161/de13c06c.pdfIn PDF document text
    • http://zijilokog.emasullivan-bissett.com/uploads/1/3/2/6/132695839/ef1050cecbfed1.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/f889915d-e378-40a7-924f-e90da6fe0684/42429071258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9013a453-64bd-4a2a-8c17-0268f8997c00/wamedojibokenoliretut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e36e23-ce74-4003-80cf-0ed51c568682/34742360745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b2a857-ce62-456e-8c05-4771e3c8d31e/wotudet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e983e45-1ed9-4e0f-8b5f-a5e7726b43ad/zasimopovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9daa377-1cae-4dc5-834d-b5922d1f6c4d/wavovamogilezosodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a773d9-1c87-4148-a0c5-e487f2389347/duzoriwidiwabidunezokus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1503aa4e-8c43-4ab2-a532-aa1b73b19d89/sutazawenosezavilegifeni.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_off00008408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8408 5152 bytes
SHA-256: 2c607c711305ece93a6772e504fdd1e2e910b042d17dfc0ae216a6f56b6c106c
font_01_sfnt_off000095b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95B7 13928 bytes
SHA-256: 2780d5a1930e76b09329f829abff04da9f75f74f03e2ce29862cef2ff8bc1b28

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