Malicious PDF — malware analysis report

Static analysis result for SHA-256 916f5f0e4c132fe5…

MALICIOUS

PDF

45.5 KB Created: 2020-08-29 22:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71bc299e4a154a7d21d11c7f91599fd5 SHA-1: a0d894785497b502bf3a75ea50d18d0563a75bc3 SHA-256: 916f5f0e4c132fe5b20c7b1ea7573fb8799d3683f887a9167c850d4d8a34b221
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, a technique often used in SEO spam or phishing campaigns to drive traffic to malicious websites. One of these links, 'https://ttraff.cc/wix?keyword=i+want+to+grow+more+xenoverse+2', is identified as a malicious redirector. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which can be abused to create malicious PDFs. The primary attack pattern observed is the use of a link farm to direct users to a malicious destination.

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.cc/wix?keyword=i+want+to+grow+more+xenoverse+2
    • https://static.usrfiles.com/ugd/b8c837_38281d21d2b74252840743180cf1cba7.pdf
    • https://static.usrfiles.com/ugd/913720_527462c5092b4313916eb9ca1307da2b.pdf
    • https://static.usrfiles.com/ugd/b8c837_579b58be6a204ab0a0a1d737762d1c45.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_4af8110f9df84ad8bd9b9d92b7cfe0b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf7e75be42e84fb39461b4b2bf6d0847.pdf
    • https://cdn.shopify.com/s/files/1/0468/8366/8125/files/.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4201/files/vuvitixeniv.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4097/files/generosemun.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/arbeitsvertrag_kostenlos.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4005/files/guwugafudikepefu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/46814137943.pdf
    • https://cdn.shopify.com/s/files/1/0430/2526/8889/files/char_array_c.pdf
    • https://cdn.shopify.com/s/files/1/0439/0515/5227/files/administracion_de_pequeas_empresas_libro.pdf
    • https://cdn.shopify.com/s/files/1/0457/4353/8332/files/domain_of_composite_functions_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/stock_market_trend_analysis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008d10.bin
6b6c4b577503bf471857ce43377d920fe778b2694140638e707aff1f3bbd8915
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8D10 17936 bytes
font_00_sfnt_off00005818.bin
d68cb16d60bef1a2a0d4f8383a466a63e29e19596c8853c9594acfcb69c3e26b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5818 5260 bytes
font_01_sfnt_off00006a05.bin
9aa3076043d3d8ce2645945c0f5a678b19f6e8c4d59162fa257913fe4a3bdbbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A05 10240 bytes