Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84f632049dc7d03…

MALICIOUS

PDF

43.1 KB Created: 2020-08-31 17:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fca467b72594f0830d44c507d8c444ac SHA-1: d59ce83230d38c65cae30192172999c7c532733f SHA-256: c84f632049dc7d03fcb2b869493dc94d94760c8f92c7025dfbcf88790c722b8e
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised with a song lyric to appear benign. The ML classifier strongly indicated maliciousness, and the PDF structure includes a large number of external links, suggesting a link farm or redirection tactic. No scripts were extracted, but the primary attack vector is the malicious URL embedded within the document.

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=westlife+flying+without+wings+lyrics
    • https://static.usrfiles.com/ugd/8b9728_b4cfc7fa394e4c8dad798a243821760e.pdf
    • https://static.usrfiles.com/ugd/b8c837_4622dc215d2e4f94b6f89ab7e5d0f771.pdf
    • https://static.usrfiles.com/ugd/f55bec_a9ac87c22be143ebb1d95f529c7c9182.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_2f2e83c159f64a5aae676ca813e9ec8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d266402472414158b460019f36a765e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b4006b263a44d7881db2fe21a027e61.pdf
    • https://static.usrfiles.com/ugd/b8c837_76409856b9294693a9f06cf6e0a0edd5.pdf
    • https://cdn.shopify.com/s/files/1/0435/8681/4109/files/formato_de_papel_66x96.pdf
    • https://cdn.shopify.com/s/files/1/0434/9696/4261/files/zetapexafesijuxikowof.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2755/files/koduwewufiluwid.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/wilibuve.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_off00006aba.bin
a975a322c1ff6c24b764e7a83aaff8b883e4bff632d73f310378bb9e7cc9cf62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABA 5140 bytes
font_01_sfnt_off00007c5c.bin
1da86b8004c710134125663dd87e28a15d321603984a3d6233691be1e06ea792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C5C 10340 bytes

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