Malicious PDF — malware analysis report

Static analysis result for SHA-256 540979da1e97fec3…

MALICIOUS

PDF

45.0 KB Created: 2020-08-31 10:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b601b9e81b2bb2c1abedd63fe2b4a4dd SHA-1: f348dfec7eb1123e0be001b3c01f619f0ec52a8d SHA-256: 540979da1e97fec3f4c98ce23e887b630e6df5a512e5194c7bd362c1cae36279
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to 'ttraff.cc', identified as a malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and a list of benign-looking PDF titles, suggesting an SEO poisoning or link farm tactic. The ML classifier also flagged this PDF with high confidence.

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.cc/wix?keyword=lista+de+sinonimos+e+antonimos+em+portugues+pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7904/files/92341998220.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/46223651468.pdf
    • https://cdn.shopify.com/s/files/1/0433/5665/1669/files/96602934301.pdf
    • https://cdn.shopify.com/s/files/1/0432/3010/1668/files/rajamijodibexe.pdf
    • https://static.usrfiles.com/ugd/02beb7_0e01e612660f41eba716e17bbddfdbce.pdf
    • https://static.usrfiles.com/ugd/c5d40f_094bee1213ef4c45a67cc43ad7bba501.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_41f42f79b0a241bcacaaf455453e4e11.pdf
    • https://static.usrfiles.com/ugd/0f5b72_9c1e8456e9e84314869c279aca9ccaf8.pdf
    • https://cdn.shopify.com/s/files/1/0432/4743/5940/files/4186461270.pdf
    • https://cdn.shopify.com/s/files/1/0437/0602/4090/files/79110335356.pdf
    • https://cdn.shopify.com/s/files/1/0439/8533/8526/files/kojudinamirunov.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000584b.bin
a96176a620b5066788e98d9aea754768236ecf52d64a4dedbf732fc6449ea08b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x584B 5272 bytes
font_01_sfnt_off00006a20.bin
5d6e851b26d6919fe8811330781450190c3a2cb8e12c107cc0eab8bbe88fbcdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A20 12528 bytes
font_02_sfnt_off00008fee.bin
7c776e5eea023699f371194d12e6bf94cc07d0f218a2e329aa39d16e66640f7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FEE 16180 bytes

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