Malicious PDF — malware analysis report

Static analysis result for SHA-256 65db0d5d8b939906…

MALICIOUS

PDF

43.8 KB Created: 2020-08-29 08:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6d439d47044958155afd27aecf32716 SHA-1: f45af5f6a90303a0ca1679325e7e76f2014697f0 SHA-256: 65db0d5d8b939906cb70b323fc368b69ac11f4ce9bde361fd90e2a704671ac3f
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 benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=naruto+character+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1653/4685/files/list_of_pharma_companies_in_tamilnadu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9245/1235/files/consul_template_variables.pdf
    • https://cdn.shopify.com/s/files/1/0434/3706/4344/files/nigabod.pdf
    • https://cdn.shopify.com/s/files/1/0436/4691/0624/files/87315115473.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/sumuridarugowoke.pdf
    • https://static.usrfiles.com/ugd/b8c837_c283785eeb7249c19aeaa88ad8b05c3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd07e64e78e742bd9d6d4af57451afde.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b115f2842dc46fd86c817f23cd85627.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a5aa4b91117444d966558782b815cbe.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3fe03b5f37441ef8720a6ec74cb2d99.pdf
    • https://static.usrfiles.com/ugd/b8c837_baa0969211824cab9431dfad0ba1794e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d746cacea8cd4c9a86ccd86b9cf76171.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e1f009e08604b0eae5e5e8db31808df.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1a25227efe24efa84f4228e272ced14.pdf
    • https://static.usrfiles.com/ugd/b8c837_d558dee8f9be4cbfb843ce2cdba29e34.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9dd6113809a4788a1558277233cf625.pdf
    • https://static.usrfiles.com/ugd/b8c837_31d95a695f884083bc1682679f5bd960.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc2c3690156841729add3e999934dfc9.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_off00006e75.bin
81c129ba3036bd2a7734019a5d1b2f7ba0c61ae70dfcf84cfd75596d2165eb5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E75 4960 bytes
font_01_sfnt_off00007f4e.bin
ca15368975e38dd4e7f6278a3bdc2f6c72ae8ee2e1b8d620e1370c6883740ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4E 10308 bytes

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