Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23fba1cab2dc4dd…

MALICIOUS

PDF

40.5 KB Created: 2020-08-29 22:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c48c3ee85c06c5ca967972818e93b92 SHA-1: 51b72d70b2b5f4ea32c8ce68bc96983bea9ccb07 SHA-256: f23fba1cab2dc4dd5cc6a7799ccaa9f30582d606fb0efe7ed8fc8f78e0c87507
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to 'amigurumi knitting patterns free download'. The primary malicious IOC is the redirector URL, which is likely used to serve further malicious content or initiate a download. The PDF_SEO_LINK_FARM heuristic suggests this may be part of a larger campaign to generate traffic through SEO-optimized PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=amigurumi+knitting+patterns+free+download
    • https://static.usrfiles.com/ugd/b85eb0_b29b86375159467e8fe33f942aed2ebc.pdf
    • https://static.usrfiles.com/ugd/b8c837_33577a52336a415ea93165f1e69288e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e6b4f78c61047bbb36f3180580c07c0.pdf
    • https://static.usrfiles.com/ugd/09c3c7_53ea3b12ede44a4dbadf5d99d6579f33.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/nojorudojobarodijiwogam.pdf
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/11089887824.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2854/files/cadbury_report_1992_corporate_governance.pdf
    • https://static.usrfiles.com/ugd/b8c837_16b30f68576a4f64a3256c12a3b64e22.pdf
    • https://static.usrfiles.com/ugd/accd1f_4d50bb8e10f44ae9ae3d87fd1a844eab.pdf
    • https://static.usrfiles.com/ugd/b8c837_2221e226f0e647fa94630d322fa78eca.pdf
    • https://static.usrfiles.com/ugd/136d07_c943a04dea6241719868643b706ad01e.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_off00006045.bin
39c58e9a43956d65e2f722be8d45d7d5968f6e4ffbec46d3fcdd4a41c998a283		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6045 5504 bytes
font_01_sfnt_off000072fd.bin
47e52da1bf496cbb7bd59b45a992892d386144d5a38a4228049f7974bde622ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72FD 10120 bytes

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