Malicious PDF — malware analysis report

Static analysis result for SHA-256 b491eaae402a885f…

MALICIOUS

PDF

52.8 KB Created: 2020-08-20 22:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7f7a79e41845ad007f2aea16dc3e21d SHA-1: 3f6386dd921349288e4c4053c538bde402d4c808 SHA-256: b491eaae402a885ffb9470e5266a26f490fcd6ae82515cf53724eed97ad9ea1f
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'biological classification worksheet answers' and the malicious URL. The heuristic firings indicate this PDF is a malicious redirector and part of a link farm, likely designed to lure users to malicious content.

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.cc/pify?keyword=biological+classification+worksheet+answers
    • http://files.uofscdsp.com/uploads/1/3/1/3/131383954/1e0b0c2781.pdf
    • http://files.mathgeekroadshow.com/uploads/1/3/0/8/130814017/415792365def7.pdf
    • https://cdn.shopify.com/s/files/1/0428/0811/5366/files/lixagavelibu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6815/2216/files/best_wrinkle_cream_oprah.pdf
    • https://cdn.shopify.com/s/files/1/0431/6571/2535/files/54142512764.pdf
    • https://cdn.shopify.com/s/files/1/0432/3409/9362/files/vinijemiso.pdf
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/8034186377.pdf
    • https://cdn.shopify.com/s/files/1/0437/5737/1546/files/acura_ilx_0-_60.pdf
    • https://cdn.shopify.com/s/files/1/0433/8948/5223/files/79630421847.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22945880436.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/gababurabevulov.pdf
    • https://cdn.shopify.com/s/files/1/0430/8402/1921/files/business_english_career_paths_express_publishing.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_off00008daf.bin
cc76d0548e59a7841011372f22986bbb4b11715660722d9933bff85c9341e52f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAF 5348 bytes
font_01_sfnt_off00009fe8.bin
44c3a26cd2f79b85c5039f9505067b54d3bb491b60588d4f860304a3810aaf30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FE8 11788 bytes

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