Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90a3c3b14889976…

MALICIOUS

PDF

47.3 KB Created: 2020-08-30 09:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cf2db5d1c9f39a4a3e93f3014a7bc21 SHA-1: dca30b2b52b0df16cfa60bd602bba85f31657b45 SHA-256: d90a3c3b14889976e33bad03796315790f574a1f638ac534197370cd9c4b8f22
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=pinyin+pronunciation+guide'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many hosted on Shopify. The document body, though partially corrupted, includes the malicious URL and appears to be a lure related to a 'Pinyin pronunciation guide'. The primary attack vector is likely social engineering via a malicious link embedded within the PDF.

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=pinyin+pronunciation+guide
    • https://cdn.shopify.com/s/files/1/0445/3256/4132/files/factors_affecting_adsorption_process.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/58586371470.pdf
    • https://cdn.shopify.com/s/files/1/0429/3810/6023/files/todawedofepuzawimaboxav.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/nunokip.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/harvard_reference_style_guide_utas.pdf
    • https://static.usrfiles.com/ugd/b8c837_0db9ade3fb8a4bf696c58fb475f2e1d0.pdf
    • https://static.usrfiles.com/ugd/735189_260fd049eabb46f3af0169014d41e5f2.pdf
    • https://static.usrfiles.com/ugd/07625c_ba05e45df84144f380f7d46d0a78a235.pdf
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/32135199425.pdf
    • https://cdn.shopify.com/s/files/1/0438/1641/9488/files/56312019228.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/nudaloxize.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0920/files/59565822650.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
font_00_sfnt_off00005bef.bin
4e53ced29d5d3ca5745b27961f0eba7556334247453c30ed0019236c427e8a9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEF 9076 bytes
font_01_sfnt_off00007a56.bin
9cba5ac84b5d00e237c498e0b916d0c382f15c45254784dd451d43978e9d58b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A56 5132 bytes
font_02_sfnt_off00008bd6.bin
8d2a701ffe2a68208adf8d4ba00615adfa61ed99ce0e6a9783b425a7eaeaee80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD6 12016 bytes

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