Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c1d52a1b35513c…

MALICIOUS

PDF

53.4 KB Created: 2020-08-29 10:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c090fb8a750ec353091855593519d21 SHA-1: bdcfe6e3fca2395a610754fad8c6f3e03696204e SHA-256: 76c1d52a1b35513c563c48e382f008d1cd708b34f69227ca1ed203c5c913fea9
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/wix?keyword=afoa+hunting+leases', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct the user to malicious infrastructure. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points to a link farm or SEO poisoning tactic.

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.cc/wix?keyword=afoa+hunting+leases
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_57315f2387064f5b9116b351a20719dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_258b6445353442d9bddeb6151931ab4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b81ac38642b74f08bdbb3dde42b2d1c8.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/61228878171.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6142/files/kesesuwamet.pdf
    • https://cdn.shopify.com/s/files/1/0453/2862/9915/files/warehouse_clerk_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9812/files/11802588208.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/fundamental_of_plasma_physics_by_bittencourt.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7464/files/66226363807.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6846/files/6211185497.pdf
    • https://cdn.shopify.com/s/files/1/0429/9030/5443/files/wuxefodukasoxakexiwebibiw.pdf
    • https://static.usrfiles.com/ugd/b8c837_5256334a210048ee94a97f102978c2ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ce99a55629c4b23afebda09f8cda3de.pdf
    • https://static.usrfiles.com/ugd/b8c837_beba4432736d44e8bebca1d18845bce3.pdf
    • https://static.usrfiles.com/ugd/b8c837_b49899ea6ce24531be5abbcbe765ce65.pdf
    • https://static.usrfiles.com/ugd/b8c837_2da413f5cc3649dbbd2e5839352d23f0.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_off000092ec.bin
a1d8decb25557ec39ebf23c0ecb4d5656dd73758c21d694fb6c858fc833e0a02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92EC 4924 bytes
font_01_sfnt_off0000a3b0.bin
5e6e8a16706c02ff88efc6e4b2e579fc26d410c0aad41412fb09d5fb8f67f256		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3B0 10864 bytes

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