Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94b0c8d39f35f17…

MALICIOUS

PDF

48.7 KB Created: 2020-07-25 11:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ed4648d662b88f032af825cc77ec441 SHA-1: 6008490e13d4ad5d72e96a0d7cf17b6160f457a7 SHA-256: c94b0c8d39f35f17a328249b2f83ba22550b5360d50eaa3f7c952bb379268976
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 'ttraff.cc', which is designed to lead users to further malicious content. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document title and malicious URL.

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=rigidez+articular+definicion+pdf
    • http://files.dfhsscienceresearch.org/uploads/1/3/2/6/132695543/2884453.pdf
    • http://files.phthian.com/uploads/1/3/1/1/131164440/2019691.pdf
    • http://files.biddylids.com.au/uploads/1/3/2/3/132303163/xidekin.pdf
    • https://cdn.shopify.com/s/files/1/0430/5495/6695/files/gasofosa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6839/files/76820777913.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/54160096297.pdf
    • https://cdn.shopify.com/s/files/1/0431/0299/4586/files/fazunenilariraxibe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/39713004720.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6176/files/tijuzurefiwerebakuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6550/0060/files/8182325128.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/filokalewejunimasejipi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/marawojonujiti.pdf
    • https://cdn.shopify.com/s/files/1/0427/7967/2735/files/31611293848.pdf
    • https://cdn.shopify.com/s/files/1/0432/5172/8546/files/14596709060.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/
    • https://cdn.shopify.com/s/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000829b.bin
baf5be644974d65b016ef48a0bd6d226f5a83cf075ca26c81744ebeabbd88977		 pdf-font-stream PDF embedded font (sfnt) at offset 0x829B 5084 bytes
font_01_sfnt_off00009400.bin
7cb2232db34b99299eb2d8070d518f1e70d09db1503721a416a543f5e36d4dd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9400 10012 bytes

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