Malicious PDF — malware analysis report

Static analysis result for SHA-256 b841180178cd3a69…

MALICIOUS

PDF

39.8 KB Created: 2020-08-17 07:40:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03a1f82210b089ace13a4ddc2de7e70f SHA-1: faa8399113198ec6819e8f83d836db81f87ed0cf SHA-256: b841180178cd3a69b8589dfac20e145e16e36edd1a22f796cd776ce66aeac9ad
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as a link to 'bass guitar books pdf'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that the primary URL, https://ttraff.com/pify?keyword=bass+guitar+books+pdf, leads to known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic suggests the document is part of a link farm, likely to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the target URL and other embedded URLs, reinforcing the lure.

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.com/pify?keyword=bass+guitar+books+pdf
    • http://files.sdsuengineers.com/uploads/1/3/0/8/130874162/7962854.pdf
    • http://files.parkcitybrewery.shop/uploads/1/3/1/4/131437079/vafutofuside_puxawos_simesokaluv_nakimowatafawin.pdf
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/69085545739.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1657/files/61370767556.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/70970727839.pdf
    • https://cdn.shopify.com/s/files/1/0435/9893/8274/files/14145144540.pdf
    • https://cdn.shopify.com/s/files/1/0428/3272/4124/files/folazigonuredem.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/6044140433.pdf
    • https://cdn.shopify.com/s/files/1/0431/2878/3002/files/risexoxaxinabu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/68510280732.pdf
    • https://cdn.shopify.com/s/files/1/0431/7275/7670/files/agama_adalah_candu_karl_marx.pdf
    • https://cdn.shopify.com/s/files/1/0452/3776/4256/files/soxolom.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_off00005e0f.bin
cea571a3fb5fd4f2d8c3e059e5f8b88390acc3e7e83d0955d743cde572a15a7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0F 5428 bytes
font_01_sfnt_off00007090.bin
9e439817dc28771beb181bcb40da7ce046e9666af8823de2046f7229781855b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7090 10068 bytes

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