Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09798270943c376…

MALICIOUS

PDF

64.5 KB Created: 2020-08-28 23:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbd3f9e51cc9cfb18b14b4f7bed58baf SHA-1: f3dfb3c7576a9daa51b0d94651f7c7b1b5edf283 SHA-256: b09798270943c37681ef1ca3cbe722fa427263cdaea9403f1ff3ee3cba2eae45
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm. The primary malicious URL identified is https://ttraff.ru/wix?keyword=curious+lockbox+poe. The document body contains obfuscated text and embedded URLs, further supporting the malicious intent of redirecting users to potentially harmful content.

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=curious+lockbox+poe
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3785448733.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67641838088.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1871/files/cemu_title_keys.pdf
    • https://cdn.shopify.com/s/files/1/0428/5438/3782/files/34850305171.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bf7263bb05a4677a9a3ee81b261f641.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc759c359be643d1a5467d6609002bdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d131643174e403598696e0872934691.pdf
    • https://static.usrfiles.com/ugd/b8c837_de08946a9d27462793c77bec0e9c467d.pdf
    • https://static.usrfiles.com/ugd/b8c837_e73519f9ed3340439bb3c4590368a882.pdf
    • https://static.usrfiles.com/ugd/b8c837_c65af926c56240ddb3ca1dde6b75fe90.pdf
    • https://cdn.shopify.com/s/files/1/0437/7657/3601/files/gajid.pdf
    • https://cdn.shopify.com/s/files/1/0433/1634/7035/files/guardian_transmitter_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0445/3682/3972/files/verb_dictionary_english_to_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9584/files/2241242485.pdf
    • https://cdn.shopify.com/s/files/1/0430/1930/5113/files/convert_slope_intercept_to_standard.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_off0000c16b.bin
700ba9fe9c3619a5f9910f5d12f46419d8b83a25113c3ba8877c6ab896205c43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC16B 4892 bytes
font_01_sfnt_off0000d222.bin
a282f7f790618b3a027ceb88a08475cb151ca87c84a7c2f8f77c8438c3e74f15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD222 10260 bytes

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