Malicious PDF — malware analysis report

Static analysis result for SHA-256 b996391e56c5109a…

MALICIOUS

PDF

37.1 KB Created: 2020-07-14 09:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58afc0a104de4a0feafeee30582c03ee SHA-1: fff27646ce83ae7a470e1949f0a71383fd40fcff SHA-256: b996391e56c5109a728f0f936e11c9608ac9de5de282a149ade0bdf1a191f567
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, indicating a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for SEO poisoning or to mask malicious links.

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/wb?keyword=esl%20both%20either%20neither%20worksheets
    • http://files.boissys.com/uploads/1/3/1/3/131398141/814da7d8376c424.pdf
    • http://files.taniamackey.com/uploads/1/3/1/3/131379231/0622a877a9e0.pdf
    • http://files.bisonsbikes.com/uploads/1/3/2/6/132682754/3729316.pdf
    • http://files.slmspto.org/uploads/1/3/2/6/132680932/1493219.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/44869521767.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetuvoveluganimuwejipas.pdf
    • https://cdn.shopify.com/s/files/1/0431/9277/8901/files/sexeratokujezimobod.pdf
    • https://cdn.shopify.com/s/files/1/0432/0608/2717/files/70594421430.pdf
    • https://memibenamefu.files.wordpress.com/2020/06/dewesusuvikanexod.pdf
    • https://takojezo.files.wordpress.com/2020/06/54380819878.pdf
    • https://fipoxek.files.wordpress.com/2020/07/25704933600.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/naxodapi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/ladunojilered.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/varapef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40573574370.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/rorizozuguvapopej.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6909/files/litotiguvomiwada.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_off00005683.bin
7f9f373a90f5d1380d06cd16806efcd893a8b495e48019153f2460b2c6879e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5683 4604 bytes
font_01_sfnt_off00006623.bin
75652450182302b9ee092cf877ebef787e53a86e7481d620ad23de540b993bfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6623 9596 bytes

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