Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc108b9f487ef61…

MALICIOUS

PDF

44.2 KB Created: 2020-09-30 03:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3af0c46b71da21768e7c553376082356 SHA-1: d124417d36ff75b36d720ec19a692c10e49b7d3f SHA-256: 9fc108b9f487ef61e6328a9c19b0f6d0e2620cf3465552ff044318307429a5c3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to external PDF files hosted on various domains. One URL is identified as a known malicious redirector. This suggests the document's primary purpose is to act as a link farm, potentially for SEO manipulation or to redirect users to malicious content. No scripts were extracted from this sample.

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=antigone+jean+anouilh+pdf In PDF document text
    • http://files.guelphpropertymanagement.com/uploads/1/3/1/3/131379174/nigowenazoduta.pdfIn PDF document text
    • http://files.tesoltime.com/uploads/1/3/1/4/131406391/1473909.pdfIn PDF document text
    • http://files.ryenet.net/uploads/1/3/2/7/132740798/fadaziduxikuzur.pdfIn PDF document text
    • http://somag.wtlaverack.com/uploads/1/3/0/8/130874655/582d4.pdfIn PDF document text
    • http://files.danvaningen.com/uploads/1/3/0/9/130970006/nomiwevifarewis-rusojo-bugavomi-gibobomupato.pdfIn PDF document text
    • http://pijin.brijcommunity.org/uploads/1/3/2/3/132303354/mixawav_lunikufazujakoz_nobikok_segipegaxesol.pdfIn PDF document text
    • http://files.thebalancingpath.com/uploads/1/3/1/4/131454670/fetesifalox.pdfIn PDF document text
    • https://site-1037055.mozfiles.com/files/1037055/89086632463.pdfIn PDF document text
    • https://site-1036852.mozfiles.com/files/1036852/juvesono.pdfIn PDF document text
    • https://site-1037205.mozfiles.com/files/1037205/16724789005.pdfIn PDF document text
    • https://site-1037094.mozfiles.com/files/1037094/dumesuzi.pdfIn PDF document text
    • https://site-1036958.mozfiles.com/files/1036958/75371157504.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3342/0199/files/7801030819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/solutions_manual_for_physics.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_off000070b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70B1 5096 bytes
SHA-256: 61279f334b38f83d33de86761bd7906b911d4cdb3f9db9ad6875c57027d39be1
font_01_sfnt_off00008212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8212 10064 bytes
SHA-256: fc7d66996c9a9cb03bb695efa274803fe1f20ed4dae89725a534d0c443f9cba2

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