Malicious PDF — malware analysis report

Static analysis result for SHA-256 396bc311cfd89bbb…

MALICIOUS

PDF

42.9 KB Created: 2020-08-04 18:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b8f3bd5f992465dae4a854b0f563d15 SHA-1: 9e44690cd9a5dd832d6c2a5a140c7d3e81475d0b SHA-256: 396bc311cfd89bbb0638ab3c0f0f021c9e7008380f60514c218dd59126d7c915
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'building construction technology book pdf'. The primary heuristic indicates a malicious redirector link, and the presence of numerous other links suggests a link farm or SEO poisoning attempt to distribute malicious content. The file was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which could be leveraged to package 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/pify?keyword=building+construction+technology+book+pdf
    • http://files.dvaughnpershing.com/uploads/1/3/2/8/132814166/8ea61b2a.pdf
    • http://files.usseawolf.com/uploads/1/3/0/7/130739693/4684895.pdf
    • http://files.stkittswatersafaris.com/uploads/1/3/1/3/131384401/sokupebiker.pdf
    • http://files.tilliesnevada.com/uploads/1/3/1/3/131379612/xapixivote-pipugu-neruxesivalu-wifuf.pdf
    • http://files.azkillerbeessoftball.com/uploads/1/3/0/8/130874518/jemizip.pdf
    • https://cdn.shopify.com/s/files/1/0431/1633/1172/files/65998770320.pdf
    • https://cdn.shopify.com/s/files/1/0429/3305/9737/files/tavazotomeruxul.pdf
    • https://cdn.shopify.com/s/files/1/0435/1731/3176/files/tefobizasogupazijinil.pdf
    • https://cdn.shopify.com/s/files/1/0433/6294/3144/files/61197722596.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/26409942319.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/jugamevudelejodolegagili.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6327/files/27575296433.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7546/files/nabixobujokiroxegaxubodix.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/23456795385.pdf
    • https://cdn.shopify.com/s/files/1/0431/0456/7450/files/dogoxasitodire.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5208/files/sudapex.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_off00006909.bin
e46341f918cd80d531622f30f2522a629bfabbf82317d92741a89358e88695ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6909 5564 bytes
font_01_sfnt_off00007c07.bin
1606bd9023a04a83e08a9ac03336827471c8679de0aff5353f218ead06cdf4bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C07 10208 bytes

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