Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ba807d8ae672c6…

MALICIOUS

PDF

39.9 KB Created: 2020-08-09 06:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0344feccb4e2f0fc6faf80e3c95ff1cc SHA-1: 74bb6b65db93c5646bcf0016929b4a4dbdbf7097 SHA-256: 85ba807d8ae672c6d465c191b177cd40eb68ee6cd6b2f3f761e56e31ff3d3175
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=relative+clauses+exercises+and+solutions+pdf'. This indicates the document's primary purpose is to lure users to a malicious site. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on shopify.com, suggesting an attempt to manipulate search engine results or distribute content broadly. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=relative+clauses+exercises+and+solutions+pdf
    • http://files.biodiversitymarine.com/uploads/1/3/0/7/130776058/fojarikazota.pdf
    • http://files.pack911ws.org/uploads/1/3/0/9/130969659/wutegofuwaxizom.pdf
    • http://pafexij.mauriziobongiovanni.com/uploads/1/3/2/6/132681352/fexidimetavizu-pixekalulajer-vufulizaza.pdf
    • http://files.haverhillauthenticsicilian.com/uploads/1/3/1/3/131380771/denuxideru_nifixa_bafepadamofuw_fiduze.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6477/files/85568755295.pdf
    • https://cdn.shopify.com/s/files/1/0428/0057/8723/files/metabolism_of_proteins_biochemistry.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/rapixob.pdf
    • https://cdn.shopify.com/s/files/1/0429/6661/4175/files/track_phone_number_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/4567/5420/files/64513749541.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/the_apocryphal_books_of_the_new_testament.pdf
    • https://cdn.shopify.com/s/files/1/0430/3880/2073/files/pegegetitukira.pdf
    • https://cdn.shopify.com/s/files/1/0437/7113/4106/files/bavuk.pdf
    • https://cdn.shopify.com/s/files/1/0440/5883/7142/files/new_holland_ls170_specs.pdf
    • https://cdn.shopify.com/s/files/1/0440/4166/6710/files/embo_impact_factor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11411440246.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_off00005d25.bin
5ab3d4d1e6b1a399918eeeaa38004052874feb4a2213ecdf6bafd1bd9238e961
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D25 5284 bytes
font_01_sfnt_off00006f3a.bin
88798144bd183724a990ac9c62e4d04a8bcfb5f697fd70de504ed055218a4aea
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3A 10316 bytes