Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ac0d766a3c07cc…

MALICIOUS

PDF

43.3 KB Created: 2020-08-29 04:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 024be728fae366d36b5070b6de957589 SHA-1: 25d648fa437288e446e4b386d6829f7eccbd69d3 SHA-256: e3ac0d766a3c07cc450d112a6cfb8b4363cdaa3fecbf6302e64d8b50ad7e94fc
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a 'PDF link farm'. One of these links, 'https://ttraff.ru/wix?keyword=susan+nichter+art', is flagged as a malicious redirector. The presence of this link farm suggests an attempt to lure users to malicious sites, potentially for phishing or to download further malware. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=susan+nichter+art
    • https://static.usrfiles.com/ugd/b8c837_161157c80ca949628ceda4d1d843ee1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbd088194cfe4ad09ad27efdbf6862d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9a11ba2a6934f87a27d202fa4456817.pdf
    • https://static.usrfiles.com/ugd/b8c837_d72b41df5afd49369f67247cd0d2f3fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e767dd5639445e2818aecc505d05f85.pdf
    • https://cdn.shopify.com/s/files/1/0432/8331/6891/files/depapejofapetobiferabujo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6216/files/13657179752.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8e6ce97fbbc49cebf0436a1988aaf6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e63eecc5c7444d6f96fb954dbe4207c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_90e518543667433cbb1d34ab83fc318a.pdf
    • https://static.usrfiles.com/ugd/b8c837_aeff4ba2c74d4a128f8b9975cb84a643.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/99825991015.pdf
    • https://cdn.shopify.com/s/files/1/0443/8307/6518/files/zofigekufebejabarib.pdf
    • https://cdn.shopify.com/s/files/1/0445/8138/8452/files/pig_latin_converter.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_off00006ccd.bin
94683460af3b2fb83fa43c3fa3698416ad2d6cea20a7b9df1b135bbe8c81e7f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCD 4956 bytes
font_01_sfnt_off00007d8d.bin
47ced1fee16913e58fe1c98eeb3538a5a254e46e9c6a4262e0be5588cf7863c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8D 10272 bytes

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