Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f87212c31c4648…

MALICIOUS

PDF

39.2 KB Created: 2020-08-31 16:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0387a79d69d2b3ef49ac648c851e880a SHA-1: 717a3131b856f23b5cc38b97e20a35ead80f3063 SHA-256: 35f87212c31c464846b69a6872b41c94120d0ed4fd4d03a3845f57cea49d3e80
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to fitted sheets and includes the malicious URL. The presence of numerous embedded PDF links, many hosted on shopify.com and static.usrfiles.com, suggests a link farm or SEO poisoning attempt to mask the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=fitted+sheets+for+standard+mattress
    • https://cdn.shopify.com/s/files/1/0443/0092/7132/files/46480112590.pdf
    • https://cdn.shopify.com/s/files/1/0427/9903/8631/files/accident_incident_report_form_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/38461405656.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0840/files/neduwupew.pdf
    • https://static.usrfiles.com/ugd/3f80ec_e348f9df665647c2be0d727ffb92aa9b.pdf
    • https://static.usrfiles.com/ugd/76156b_b95f6e90427848189add8867ca71aa88.pdf
    • https://static.usrfiles.com/ugd/b8c837_33ace708e8524835b9e9b6d815723726.pdf
    • https://static.usrfiles.com/ugd/576447_2b48889bcb15457aa04f16f2b38f6bf5.pdf
    • https://static.usrfiles.com/ugd/b8c837_bfc36dbfc92841ee91c1c25decd4610c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9220537f8c364af78591351a6a777901.pdf
    • https://static.usrfiles.com/ugd/79e0dc_04d4e8c6c6434cd980a589ddb1165f8c.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_off00005b46.bin
0b5ec519482ee5e17e553c9ef62f61b7f6b4cea7cadf1abef724c202d6e0c41a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B46 5068 bytes
font_01_sfnt_off00006c5d.bin
414c3175efb500be6f949598eedf6e96128a48a32e4a559683fdebc670052608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5D 10496 bytes

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