Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d508a689f6eebee…

MALICIOUS

PDF

40.1 KB Created: 2020-08-20 10:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4197ca03d9776b8715ce5654e13fb84 SHA-1: 988d21c83aa2058ddb73de96790859c33dcfc646 SHA-256: 2d508a689f6eebee51d0dadf5931949bb58bf4f529738b62bceb88381bd279af
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=crop+rotation+notes+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. No scripts were extracted from this sample.

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/pify?keyword=crop+rotation+notes+pdf
    • http://files.pureromancebyniki.com/uploads/1/3/0/8/130874667/8977218.pdf
    • http://vemewavow.charissaclarkhowe.com/uploads/1/3/0/9/130969204/fukepopobad.pdf
    • http://tokitav.uclasaepi.com/uploads/1/3/0/8/130874493/lekererokenakulij.pdf
    • http://files.samdillonmusic.com/uploads/1/3/0/7/130776589/cb44f.pdf
    • https://cdn.shopify.com/s/files/1/0431/8045/8144/files/71170562950.pdf
    • https://cdn.shopify.com/s/files/1/0430/8461/1733/files/92059309356.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/anemia_aplstica_fisiopatologia.pdf
    • https://cdn.shopify.com/s/files/1/0432/7024/2460/files/substitution_and_elimination_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/67753874115.pdf
    • https://cdn.shopify.com/s/files/1/0428/7866/4867/files/vivizoxosejirukem.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/slayer_leecher_keywords.pdf
    • https://cdn.shopify.com/s/files/1/0441/2869/8520/files/77900607906.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_off000062b7.bin
ba77fed6e1162038fbdc2bb4bc78a2946fc8511c059c1b6a4eb9fa8d2aca852f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B7 4908 bytes
font_01_sfnt_off0000736c.bin
fee58c4a03e32ff180599b1765747858d942ffcfed0387d6aa59c4e68cb826bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x736C 9560 bytes

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