Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0636dbc74db3321…

MALICIOUS

PDF

31.9 KB Created: 2020-08-31 20:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1fefbe7e7773089872ddd63837bc389 SHA-1: 638d546473f648d6ee5369bbc8e0db59806e50b9 SHA-256: f0636dbc74db3321a783da9a9763933af072b5ceb50df155b91472f7999c9cb8
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a critical heuristic for linking to a known malicious redirector, specifically 'https://ttraff.ru/wix?keyword=c+moran+zapatillas+negras+plataforma'. Additionally, another critical heuristic identified it as a PDF link farm containing numerous external links, with 'https://static.usrfiles.com/ugd/fb83f1_a022cc6fd4d548569a8b0fa78636558c.pdf' being the first listed. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL and several other PDF links.

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=c+moran+zapatillas+negras+plataforma
    • https://static.usrfiles.com/ugd/fb83f1_a022cc6fd4d548569a8b0fa78636558c.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ddb8706259343fda196a32fad2e67d7.pdf
    • https://static.usrfiles.com/ugd/1e32c2_60cd8075a0154da1a2a3024f92c2257b.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab96afde982e44ff8247b25864394a6b.pdf
    • https://static.usrfiles.com/ugd/544c7e_fef4e78b8be845fe9390d7f186b1889c.pdf
    • https://cdn.shopify.com/s/files/1/0460/7891/8820/files/kukukijabemunetavugeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1616/files/index_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0459/8343/2866/files/47960738456.pdf
    • https://cdn.shopify.com/s/files/1/0433/3659/7654/files/pubezox.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5174/files/manualidades_para_hacer_en_navidad_con_fieltro.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/honda_motorcycle_uk_certificate_of_conformity.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_off00004100.bin
f36bee27e7561d3560d5002ca70820d251b527ea3e70978370a17a1b47b7abee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4100 5176 bytes
font_01_sfnt_off00005287.bin
d9988b86d2b3c445c169bdecd9f42c998168874d8f6dbef7dcdb2d611fffb7c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5287 9520 bytes

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