Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b519b618c0fbe9…

MALICIOUS

PDF

40.4 KB Created: 2020-11-02 16:58:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f1f326cc3778b17f51a3c962e87db0d3 SHA-1: 1df2f86722949f34a721a8bbcceedf32ce222b94 SHA-256: d8b519b618c0fbe979ca57ef62e90c06add7a8f9692bcc4aa02435f79422c7ad
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, https://cctraff.ru/strik?keyword=organic+chemistry+brown+pdf, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains this URL and other URLs, reinforcing the link farm heuristic.

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 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.
  • 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=organic+chemistry+brown+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f8e500fcae9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f8a0837eb0a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5f8dcdba9504d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404738/normal_5f931b21d90d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_5f9edecb96af5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409811/normal_5f966c295db6b.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/1/0438/4735/2485/files/cutting_edge_new_edition_starter_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9af97d-333a-4e90-aa17-7cdb9c1b14a4/zivaxegaripupesifimik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/181064c7-2746-4d49-b001-83d737015a2c/28930945436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1bdab6e-7531-4325-abe9-0a223ba0967e/xexevipabuferifomasegevim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a78511cd-8b29-419f-9e72-3ca9660b1e63/timatelukunojovamefonat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306ba2b4-8dda-483c-88b8-7ec7af343c1f/gifijebaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb4acfb-4562-47aa-b01e-560ef3f5d694/85817237214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb61fb9b-4ed4-4d36-9884-116a740a5fde/5012345150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9329cdfe-2650-46ac-8cea-9e89a84436e7/the_egyptian_mika_waltari_audiobook.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_off00005e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E03 5896 bytes
SHA-256: c60dc216b793c17d4b80270b7e28b9832e9e94deb64dd66dbf107b7b733013b1
font_01_sfnt_off000071fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71FD 10452 bytes
SHA-256: e2ead854145e56f2baa690669175ed3df9b991d4a57442ca3e2160ccde5ffc50

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