Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9baa0ee76c1814…

MALICIOUS

PDF

43.7 KB Created: 2020-09-30 08:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3649f79e1b0a6e916835238f2668b515 SHA-1: 2cc79e7f60855f1e5df1a9009214ca169f5d51d3 SHA-256: 9d9baa0ee76c1814554bfaf4e38beb913ac1ae576854ef4fedc8a1b054ba2f86
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious due to its function as a link farm. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document's primary purpose appears to be directing users to potentially harmful websites, leveraging a large number of links hosted on various domains.

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/strik?keyword=exportacion+de+arandanos+de+peru+a+china+pdf In PDF document text
    • http://lugiwej.miwildlife.org/uploads/1/3/2/7/132712354/1378498.pdfIn PDF document text
    • http://files.canalstation.net/uploads/1/3/2/6/132682436/570337376876.pdfIn PDF document text
    • https://site-1036869.mozfiles.com/files/1036869/46397480095.pdfIn PDF document text
    • https://site-1036655.mozfiles.com/files/1036655/xojawato.pdfIn PDF document text
    • https://site-1036729.mozfiles.com/files/1036729/5630341328.pdfIn PDF document text
    • https://site-1036633.mozfiles.com/files/1036633/46104928125.pdfIn PDF document text
    • https://site-1036716.mozfiles.com/files/1036716/12928497858.pdfIn PDF document text
    • https://site-1037026.mozfiles.com/files/1037026/29035626416.pdfIn PDF document text
    • http://repositorio.utp.edu.pe/handle/UIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/699d1c6e-599b-4b44-b3b3-0b2d2d060b2e/52550048205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e929e2-ae81-447f-aba6-9e488e5b91c6/42627304944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ffc88bc-16ec-4f4b-918a-b9fa4029c600/73649778114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b22a32-a017-4033-94b0-fbd9da6e61d6/89511976544.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B66 5120 bytes
SHA-256: 02e989e245669d43d3a00299df978babf84b809837f8ba8a717ddcfe32e9caad
font_01_sfnt_off00006cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC8 11448 bytes
SHA-256: 1b365c8c00829030c7c7f21b0ae56305105c3bb4c0058d35e5ebf5c1df328202
font_02_sfnt_off0000921e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x921E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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