Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a8b7ca29fc81a0…

MALICIOUS

PDF

36.9 KB Created: 2020-08-31 04:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5eb85c42df534a0f9de0653b75528c76 SHA-1: a30d0932c7e1fbb5a0289a828c2f0c1572439d42 SHA-256: 89a8b7ca29fc81a0b4d9a9648fcaa03632b79a5162076c0b15314100ed19c3e9
120 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, ttraff.ru. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=free+sewing+patterns+tops', suggesting a lure related to sewing patterns. The presence of multiple links to static.usrfiles.com indicates a link farm designed to distribute malicious content. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or redirection attack.

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=free+sewing+patterns+tops
    • https://static.usrfiles.com/ugd/b8c837_e9a5f1c605a6426e87f9e7d95393b706.pdf
    • https://static.usrfiles.com/ugd/c1615c_8f540384ebcf466c8ce95767c06541c8.pdf
    • https://static.usrfiles.com/ugd/d54300_8a3a65ac944c4169a87263396bfae8aa.pdf
    • https://static.usrfiles.com/ugd/2b3f46_6a774e5eaad84f4492215996973ddd3e.pdf
    • https://static.usrfiles.com/ugd/105a8c_efd00b302e26410e9bdc23ed108ab2af.pdf
    • https://static.usrfiles.com/ugd/b8c837_0fd2484c14884def85a5fb0ec61fbfc7.pdf
    • https://static.usrfiles.com/ugd/daca0d_378074c5b3b04289bafeb8aba895ad98.pdf
    • https://static.usrfiles.com/ugd/b8c837_34146b85622e46a5aed24239f8c9cece.pdf
    • https://static.usrfiles.com/ugd/b8c837_d37f782aa0d8453083f83d42f24afbc5.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ee8e9394f0c476390bdde06fccc6296.pdf
    • https://cdn.shopify.com/s/files/1/0428/6011/8175/files/88992252561.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2677/files/wexegipugikidesewetuwomot.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_off000053a5.bin
0be56c857570c231eb94bd644340050a53f75c1c39ee374b054d53b62544eea8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53A5 5004 bytes
font_01_sfnt_off000064cf.bin
0362eb06420c9ca189102af73743a3dc0b2723059e8e4489853f055aa83f3cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64CF 10008 bytes

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