Malicious PDF — malware analysis report

Static analysis result for SHA-256 699163b53a650346…

MALICIOUS

PDF

40.0 KB Created: 2020-08-30 14:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f471f904c55b532b76ff91492754e84 SHA-1: b629696d03247ccfadb6a85907c10dda0863959c SHA-256: 699163b53a650346b8249cdfe35c6c7f8157b0fac890af064985c58f9b66da70
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Warhammer 40k character sheet' and a URL that is also present in the heuristics as a malicious redirector. The presence of multiple external PDF links suggests a link farm or redirection strategy to distribute malicious content.

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.com/wix?keyword=warhammer+40k+character+sheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/a6e5e9_d6b422730b24487bb03f1a6595ab9680.pdf
    • https://static.usrfiles.com/ugd/b8c837_15b281b7a1174926accdf296b76d35f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f6e631406a947208f6286d43a2ee115.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_2ac1947f44e54fc98045659983fa3d68.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b1b6fdcb2ee450ab16f69ee811afecf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2888/1313/files/sigebupisef.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9610/files/github_undo_last_commit.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/kusekimikirizivojezi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2148/3687/files/17663588595.pdf
    • https://cdn.shopify.com/s/files/1/0464/6132/1384/files/walmart_pre_application_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/8445/4817/files/99181184223.pdf
    • https://static.usrfiles.com/ugd/b8c837_fef15c207046477da26dab0b3f1520b1.pdf
    • https://static.usrfiles.com/ugd/ce14f3_6048e41abc034f768095e41d6c784a19.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef332902125d44f09dab24f6d572cbe8.pdf
    • https://static.usrfiles.com/ugd/c618e9_7b08ddc943b148fbb4b9e9093ffde7b1.pdf
    • https://static.usrfiles.com/ugd/7f16bd_44f6cbb3c2da48aca754c32a3e704cca.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_off00005c45.bin
4c277fc6b7d3dc34d2264ad1ad1b0dca97746bc99c95320f1e0057846877ee45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C45 5312 bytes
font_01_sfnt_off00006e45.bin
bfba1b65f332bc649b2172473dc0d4637275606c7c8f48e36bd630eeb0bd58b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E45 11012 bytes

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