Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c54b9848680e149…

MALICIOUS

PDF

48.2 KB Created: 2020-10-08 05:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e20abacc1d252ebbf035bdade8ae5435 SHA-1: f7576ba525a132a2875e0c4794ca3e8d21844466 SHA-256: 1c54b9848680e149565bf1fe3d9a48fc35ee75d199cf08798083eda481b28878
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting domains and a known malicious redirector. The primary heuristic indicates the PDF is designed as a link farm to direct users to potentially harmful content. The ML classifier strongly supports the malicious nature of this PDF.

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 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=i+wrote+this+for+you+just+the+words+read+online In PDF document text
    • https://site-1038556.mozfiles.com/files/1038556/57746510133.pdfIn PDF document text
    • https://site-1041086.mozfiles.com/files/1041086/71390868359.pdfIn PDF document text
    • https://site-1037865.mozfiles.com/files/1037865/16073650972.pdfIn PDF document text
    • https://site-1037018.mozfiles.com/files/1037018/99306422976.pdfIn PDF document text
    • https://site-1041860.mozfiles.com/files/1041860/robuzonerilopubikorer.pdfIn PDF document text
    • http://fojeg.eastmainstdesign.com/uploads/1/3/1/1/131164573/mugerivazojijixa.pdfIn PDF document text
    • http://files.pioneervalleytipoff.com/uploads/1/3/1/1/131164383/08a91a13d1d.pdfIn PDF document text
    • http://files.redingsmallengine.com/uploads/1/3/1/3/131383602/7ec30a906.pdfIn PDF document text
    • http://budad.besthairsaloninlisle.com/uploads/1/3/2/8/132814930/fepipafezutorefo.pdfIn PDF document text
    • https://site-1037055.mozfiles.com/files/1037055/27799759100.pdfIn PDF document text
    • https://site-1040171.mozfiles.com/files/1040171/93336744810.pdfIn PDF document text
    • https://site-1036767.mozfiles.com/files/1036767/85205405555.pdfIn PDF document text
    • https://site-1040286.mozfiles.com/files/1040286/gibaveju.pdfIn PDF document text
    • https://site-1038717.mozfiles.com/files/1038717/39392954464.pdfIn PDF document text
    • https://site-1037233.mozfiles.com/files/1037233/genupataki.pdfIn PDF document text
    • https://site-1039436.mozfiles.com/files/1039436/28885416093.pdfIn PDF document text
    • https://site-1036871.mozfiles.com/files/1036871/nejalikiferikazedozid.pdfIn PDF document text
    • https://site-1038614.mozfiles.com/files/1038614/70667191873.pdfIn PDF document text
    • https://site-1039426.mozfiles.com/files/1039426/nuvib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00007eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEF 5204 bytes
SHA-256: 53cc29b9a8e9f7aac3d7c3ef73d9b7d8ba874f52d10be82310d4da53f74840b3
font_01_sfnt_off000090b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90B7 10300 bytes
SHA-256: c32212e3c3b38863ad956e554c27dec2b468c72933c97725e77aef65e9953911

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