Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ed8480056ba6fe…

MALICIOUS

PDF

49.5 KB Created: 2020-10-07 08:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0c92282ce4d5d84459664d3dfbe23986 SHA-1: ea863027f3fb34ec8d3bbd55e45ba87b29f75a6b SHA-256: 06ed8480056ba6fe02d464eb31c9befc6633c73aaf0978412b47ba6e32bc2df9
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 pointing to external PDF files hosted on various domains, many of which appear to be disposable. One link directs to a known malicious redirector. This indicates the document's primary purpose is to act as a link farm, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=humble+and+kind+sheet+music In PDF document text
    • http://pafewi.pointyhalo.co.uk/uploads/1/3/1/6/131636725/zagarevusomujunigi.pdfIn PDF document text
    • http://degedemel.gassingamerica.com/uploads/1/3/2/8/132815961/91e316571b.pdfIn PDF document text
    • http://files.amurielyoga.com/uploads/1/3/1/8/131856516/dulefene_mubesebekeka_rajasijan_galewir.pdfIn PDF document text
    • http://ritusigid.runninonfaithtc.org/uploads/1/3/0/7/130775358/7634734.pdfIn PDF document text
    • http://pojukad.emcsdesigns.com/uploads/1/3/2/7/132710497/cb67a9.pdfIn PDF document text
    • https://site-1036680.mozfiles.com/files/1036680/46895566541.pdfIn PDF document text
    • https://site-1037086.mozfiles.com/files/1037086/mifatugovuwukexen.pdfIn PDF document text
    • https://site-1039331.mozfiles.com/files/1039331/gomuworomujafaguk.pdfIn PDF document text
    • https://site-1037211.mozfiles.com/files/1037211/matututop.pdfIn PDF document text
    • https://site-1039203.mozfiles.com/files/1039203/95583162645.pdfIn PDF document text
    • https://site-1038905.mozfiles.com/files/1038905/2439460454.pdfIn PDF document text
    • https://site-1036926.mozfiles.com/files/1036926/67956406411.pdfIn PDF document text
    • https://site-1037111.mozfiles.com/files/1037111/36432263734.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/835547f1-f9eb-4fad-b4b2-29d8d1748e6b/pavuxezifexusasabixel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2058ae2e-7155-437d-97ca-bdec514683b1/37064097155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a28a90-7e8a-43a5-a450-c9d4c1fd8276/50071062948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a14e2e34-99f1-4288-8eb5-fea678d64365/tenunikotupolajotatuxuvox.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_off00008588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8588 5248 bytes
SHA-256: d1bcbd43e395dcb05e64382c8671b72f7ad16f40dc14231ea654ca9c33a3a793
font_01_sfnt_off0000972f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x972F 10052 bytes
SHA-256: 5f1446274bd60a8425a2126ecfc3cc94ca04a58fb1d4071ab94ebafa1424a5e7

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