Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca47c01d96e9818…

MALICIOUS

PDF

33.5 KB Created: 2020-08-20 20:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cbddcb9eea6d4ca70651b63b6d06122 SHA-1: 75a82f340f199b13734013b5db2adcb666ba6fb5 SHA-256: 0ca47c01d96e98183b5f9437ee6a1ded590c4374015e32ebce466dbe7b68d86e
154 Risk Score

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 a redirector service known to host malicious content. The document body, though partially corrupted, contains a URL that is also present in the link farm, suggesting a coordinated effort to direct users to malicious sites. The ML classifier also strongly indicated maliciousness.

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://ttraff.ru/pify?keyword=summarised+or+abridged+crossword+answer
    • http://files.bonvivantgourmets.com/uploads/1/3/0/7/130774972/bee67.pdf
    • http://lutuv.andrewandmeghan.com/uploads/1/3/0/7/130739017/c18a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/pajefogigutunifegag.pdf
    • https://cdn.shopify.com/s/files/1/0439/1898/3323/files/change_to_word_document_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/pezut.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7589/files/65491954941.pdf
    • https://cdn.shopify.com/s/files/1/0431/9546/5892/files/strategic_cash_flow_management.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/xizadibotomu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/wopugemagoxijamulujumusim.pdf
    • https://cdn.shopify.com/s/files/1/0436/8557/6857/files/brave_new_world_deutsch.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043f2.bin
92664966027aa7fa20f133dffefdd56cf561f7df037e7df414f6dc37b7cef29b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43F2 5560 bytes
font_01_sfnt_off000056ca.bin
1712e34688ee583381f2d04ddafb64b0e1496cca866e4e8f816c69fe24c23fa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56CA 10196 bytes

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