Malicious PDF — malware analysis report

Static analysis result for SHA-256 6881f9f1f8f06213…

MALICIOUS

PDF

50.8 KB Created: 2020-08-19 12:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d88d0515613a266bafb9634112e4300c SHA-1: 28c16b089a424f48a26eb0c9f3ea8435ebbeac12 SHA-256: 6881f9f1f8f0621347370ef1bd1d5307c5c355a88d6c6a333336dfc09b86b89c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector link pointing to malicious infrastructure, disguised as an immigration form. The ML classifier strongly indicates maliciousness. The primary IOC is the redirector URL, which is likely used to serve further malicious content or phishing pages.

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=canada+immigration+generic+application+form
    • http://livuzeva.certaintysales.com/uploads/1/3/1/6/131636725/wupomobapur_fuwezobonojal.pdf
    • http://files.drjillgross.com/uploads/1/3/2/6/132681951/totapogomevo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/49493089499.pdf
    • https://cdn.shopify.com/s/files/1/0436/5441/4494/files/29109044386.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/mapa_turistico_de_bruselas.pdf
    • https://cdn.shopify.com/s/files/1/0432/4275/0114/files/vector_space_axioms_proof.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/46766937156.pdf
    • https://cdn.shopify.com/s/files/1/0434/8264/4642/files/reading_comprehension_worksheets_year_11.pdf
    • https://cdn.shopify.com/s/files/1/0430/0190/5315/files/galle_fort_history.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_off000088d4.bin
eaacb5f3245b010884c57f41eaa6e4323dfe33e4e61d54807970df4b6ea7a54f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88D4 5204 bytes
font_01_sfnt_off00009a6d.bin
1645ed3a7df77f292832a53ece3905eebfa63b9bd927b07e32da5bd2b3dedc1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A6D 10556 bytes

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