Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09809f53792614e…

MALICIOUS

PDF

40.5 KB Created: 2020-08-31 23:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 069d9292300056d19b24c4928f67ef1b SHA-1: 3ef4a2241bfbee07abcdcf6770b13717feca2cbe SHA-256: a09809f53792614e6fbd7a8273f2ad28f4071ec3b6ef9e563d3c91cce404438c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. The link, 'https://ttraff.me/wix?keyword=create+word+cloud+excel+spreadsheet', is designed to lure users with a promise of useful content, but it redirects to malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector is a strong indicator of a phishing or social engineering attack.

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.me/wix?keyword=create+word+cloud+excel+spreadsheet
    • https://static.usrfiles.com/ugd/4b68be_6ea7037749b04a4abc293e42c34b20c2.pdf
    • https://static.usrfiles.com/ugd/87a178_5b433ab342724083b3ffcd758de45fea.pdf
    • https://static.usrfiles.com/ugd/384ea4_f082c2d7f4be4b76b8a2d9f628d98791.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/borges_l_aleph.pdf
    • https://cdn.shopify.com/s/files/1/0428/5284/3676/files/the_look_of_disapproval.pdf
    • https://cdn.shopify.com/s/files/1/0459/9794/9087/files/megitovemajerutunesibof.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd79669ea32441c2a7b886e7b9b0e282.pdf
    • https://static.usrfiles.com/ugd/8b49c6_4b03716d2b394ab5927eb79a8c8e73f7.pdf
    • https://cdn.shopify.com/s/files/1/0463/3935/8882/files/36816972602.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2827/files/lightroom_app_free_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/4034/9082/files/87971798311.pdf
    • https://cdn.shopify.com/s/files/1/0434/2310/5189/files/mikiv.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_off0000604a.bin
2349ce4595474d900078ab42c6369d178cb546cee828bb354ab533611af5ec4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604A 5224 bytes
font_01_sfnt_off0000721b.bin
d00bf5ba856f24eaf6671e325277c3e4f1d34cee159d544fed684f17a1e96cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721B 10440 bytes

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