Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fa4eb4862da370…

MALICIOUS

PDF

50.5 KB Created: 2020-08-31 05:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 537ebf880dd68ceaae9059577bf2cad2 SHA-1: f35ce9770463bcb18fb52751e6d3cbdcba32ad2f SHA-256: 35fa4eb4862da370049b1045a877534a89d60fdf9be4045ab52fe37476a9f96e
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=citizens+plugin+1.14.4'. The document body, though heavily obfuscated, also contains this URL and references to 'citizens plugin 1.14.4', suggesting a lure. The file also exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on 'static.usrfiles.com'. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content.

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=citizens+plugin+1.14.4
    • https://static.usrfiles.com/ugd/ab63e3_7d901a613f324802b85e02d7af689904.pdf
    • https://static.usrfiles.com/ugd/9374a7_c3c7cec8f28c49bfbdc6e45e8aa0b697.pdf
    • https://static.usrfiles.com/ugd/b8c837_43fdef332629496ab9c8af89032f95dd.pdf
    • https://static.usrfiles.com/ugd/bb13a2_454d464c95654a1e8ccc0b46ae77af97.pdf
    • https://static.usrfiles.com/ugd/b8c837_905e9cdaf7a34985affe289ff31e9f70.pdf
    • https://static.usrfiles.com/ugd/52b593_5a94c0fc99f040a892ed0244c4af284e.pdf
    • https://static.usrfiles.com/ugd/d5415a_6b18b05004cd4522bc9dac2a53958fb7.pdf
    • https://static.usrfiles.com/ugd/735424_5ef34a5261354218826197b797e80414.pdf
    • https://static.usrfiles.com/ugd/b8c837_37c45fd240a541bcb1f82a62aa723d5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_41d861efb37249c79c5cdb82e032f555.pdf
    • https://static.usrfiles.com/ugd/7f16bd_da492d60e8b14109a52da219ca523479.pdf
    • https://static.usrfiles.com/ugd/f967ac_334eb6c0b5454d52a216886a92964a53.pdf
    • https://static.usrfiles.com/ugd/0bcf16_26e211ef6a1740e0ba2d711519fa672f.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/fifokamasutase.pdf
    • https://cdn.shopify.com/s/files/1/0432/1804/3040/files/mudupejovejezi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2842/1528/files/novofigiwevavad.pdf
    • https://cdn.shopify.com/s/files/1/0440/8341/3142/files/harvest_moon_a_wonderful_life_character_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0358/files/33506847045.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_off00007f6c.bin
b9b6345bf50d05b78261016ab5af1b3703ea5d752091f4e4aa1faf9f17efa393
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6C 4808 bytes
font_01_sfnt_off00008ff7.bin
b1808ebfffd7240c8f1ae0efd466449decb6b1448e495d74ecd2752e11bdb3b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF7 14284 bytes