Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed55d769cd62f6da…

MALICIOUS

PDF

45.9 KB Created: 2020-08-15 11:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba0f8be797f6f8939c4c13b0c2c888bd SHA-1: ee5985676c538625d3da42110b2c27c2e3b56fab SHA-256: ed55d769cd62f6da5504d45877c0cce7f19f8ff416d7d8e71a15ee4d2337b4cb
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are hosted on Shopify and appear to be SEO-optimized lures for document downloads. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wb?keyword=cv%20resume%20format%20pdf%20download%20free'. This suggests the document is designed to trick users into downloading further malicious content by posing as a useful document. No scripts were extracted from this sample.

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/wb?keyword=cv%20resume%20format%20pdf%20download%20free
    • http://files.sigmax-yacht.com/uploads/1/3/0/7/130739783/7724510.pdf
    • http://madit.yanktonspecialolympics.org/uploads/1/3/1/3/131398404/3240667.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/gevotozebamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9751/3381/files/nusep.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/kesumegixunoremuxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0253/5840/files/40662465310.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4748/files/52580540012.pdf
    • https://cdn.shopify.com/s/files/1/0431/0604/2013/files/kabamutibadudafof.pdf
    • https://cdn.shopify.com/s/files/1/0431/7121/7565/files/45885417321.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/dobitobogovapaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/98824415791.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_off000069ba.bin
d5efa71b8f37c319d139f1a18c0ea9438df9595cc2ef1dbf222f28dcd5347fa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BA 5196 bytes
font_01_sfnt_off00007b61.bin
1dd2f9f8b6821ec59bd812e68f2f01143981245e20719e74e7f90cfddffc0349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B61 9904 bytes
font_02_sfnt_off00009d35.bin
781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D35 4324 bytes

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