Malicious PDF — malware analysis report

Static analysis result for SHA-256 d039c82e00bff0d2…

MALICIOUS

PDF

33.8 KB Created: 2020-08-30 06:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 241b90acef3a48e4c2dc5ecb5cfe1d5a SHA-1: cae8562b9efb9a78655205cc4164599f74247051 SHA-256: d039c82e00bff0d23ea4e5c30c4d76ddc0160e0312fd0567dc1a688884b1954f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to `https://ttraff.com/wix?keyword=anker+bluetooth+keyboard+user+manual`, which is flagged as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, likely an attempt to manipulate search engine results or distribute further malicious content. The ML classifier 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.com/wix?keyword=anker+bluetooth+keyboard+user+manual
    • https://static.usrfiles.com/ugd/55cc32_a398463d91c045cb8ce9e8f5b462f696.pdf
    • https://static.usrfiles.com/ugd/b8c837_2cce5fc364844c828ead48127fa3a40c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ef67c71f51941bb8e68d7c3c09ab85f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a3b37f170d244a4b7b7ee49d1f1d659.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7082322425.pdf
    • https://cdn.shopify.com/s/files/1/0432/8767/5036/files/85916919240.pdf
    • https://cdn.shopify.com/s/files/1/0430/8559/4775/files/vuvuwub.pdf
    • https://cdn.shopify.com/s/files/1/0434/0678/6725/files/job_analysis_meaning_and_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/3197/7369/files/mathematical_proofs_chartrand_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0661/files/acme_supreme_juicerator.pdf
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/zawudubomu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4150/4927/files/calgary_stampede_map.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004753.bin
5e334138932561081d0b8e5b5a46f213029ecb851140d03ddee5e2070f03a28e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4753 5360 bytes
font_01_sfnt_off0000595c.bin
84d7d72341ed9cd4f8ca2c99942158a757d633ea8c00a5aa964f09d72b2717d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x595C 9736 bytes