Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a4ea2d4b97635c…

MALICIOUS

PDF

44.7 KB Created: 2020-08-30 04:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f2ddb1bea7750293c7e59fc97f29134 SHA-1: 69830bb12750589000ef76c1bc99adba56ba2679 SHA-256: f5a4ea2d4b97635c40ffa0d8bb1412fae9e0742fda268475720e79622276647a
150 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links. One of these links, 'https://ttraff.ru/wix?keyword=nextera+xt+protocol', points to a known malicious redirector. The PDF appears to be part of an SEO link farm, designed to generate traffic rather than deliver a direct payload.

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=nextera+xt+protocol
    • https://static.usrfiles.com/ugd/eb4c03_4267433137b54b3ea6d347232ebd1e7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b45f645a8f446e1a05ee991c4a83db5.pdf
    • https://static.usrfiles.com/ugd/b77b08_266d9178ed5a44279735853df9a9f06f.pdf
    • https://static.usrfiles.com/ugd/b8c837_28a77f0aaf4a42bf9f922650f7f0fd43.pdf
    • https://static.usrfiles.com/ugd/4cf28d_e9bdd38e70e545b784cdccbf01b310ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_2bf05d33aec643fbaf93c37a4d577458.pdf
    • https://static.usrfiles.com/ugd/cd79e3_f560209d0d4445ae81f2ed7d4bfb9c58.pdf
    • https://static.usrfiles.com/ugd/ae15ca_f803269edb764d3e8e1de773cf550c58.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/kedeperodorawam.pdf
    • https://cdn.shopify.com/s/files/1/0434/8860/8418/files/mutodol.pdf
    • https://cdn.shopify.com/s/files/1/0436/5441/4494/files/nofeme.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/18083630822.pdf
    • https://cdn.shopify.com/s/files/1/0437/6789/0069/files/1153699193.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_off0000735f.bin
a6b069a2e0e8af96351d7af8271f662fe9f1a1aa1593aa33847dffed4d537c27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735F 4788 bytes
font_01_sfnt_off000083bd.bin
b787ed95807c542aba791c3cd38f202590f3148227902e653c58bd589fa01510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83BD 10176 bytes

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