Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c25d2bbb78cc293…

MALICIOUS

PDF

44.0 KB Created: 2020-11-03 01:19:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-10
MD5: 60d2b5d58cad3182d12c4ed0e9339c44 SHA-1: 3cd6ad01d6eec9d91e4452d479393637ec946980 SHA-256: 0c25d2bbb78cc29350f8a99106454cd5925ed946f6a03b0f4bfe09b9f5a611d3
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ttraff.me/123?keyword=periodic+trend+of+atomic+size In PDF document text
    • https://rudiduwusoxu.weebly.com/uploads/1/3/4/4/134445317/cd14657c035ab9c.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/17a65f9f.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/xududev-ledavodu-jatulivarolaxe-bixebenal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393511/normal_5f9539e556b9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_5f971529393e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006ca4.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006ca4.bin)
    • https://uploads.strikinglycdn.com/files/5e908fdc-b9fb-4941-9775-4c12f212b3a7/vroege_ectopische_tekens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f493ee0-9aa2-4820-89da-ed124226ee36/47313943221.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/wigiroduvadufukupexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd5a5d7-28d3-4e19-871a-005a738d1ecb/62502997543.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/kologunuweziwetida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5146ad54-b2c8-4f90-80ef-89a60ac98061/de_onde_vem_o_meme_de_sopa_de_macaco.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8602/9994/files/kpi_mega_library_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e86f163-7cab-440e-8202-ea1ff220442d/85865346557.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 extracted file (font_00_sfnt_off00006ca4.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA4 5188 bytes
SHA-256: 6fc4e9279d846e2efa61e7c77d50347ca11ac47f03ed6d68a45334e34c59aa59
font_01_sfnt_off00007e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3A 11052 bytes
SHA-256: 6defca337d8b57ff39ab27a9c790d7fe33056715aaea606fd7b8a1a5cb4fd322