Malicious PDF — malware analysis report

Static analysis result for SHA-256 3171ddd284e7556b…

MALICIOUS

PDF

40.0 KB Created: 2020-08-31 07:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae34c9492bb2d26389d433c16e0fe3d6 SHA-1: b3ba48f5007ecbd4ac744888267eb8f6cdcf1e23 SHA-256: 3171ddd284e7556b046f36a3690f691749e271d1d6cd06552ba5628bc3265120
150 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains a mass of external links, including one pointing to a known malicious redirector at 'https://ttraff.cc/wix?keyword=sport+and+exercise+psychology+degree'. The document body is heavily obfuscated, but the presence of numerous links suggests a link farm or redirection strategy to deliver a malicious payload. 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.cc/wix?keyword=sport+and+exercise+psychology+degree
    • https://static.usrfiles.com/ugd/5e81b9_df88437434f64b58ab2749c418cf1b0e.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_e677627b5add4307ba16410dc54b7202.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_bc8f00953ca047a8af05ea859f0d086e.pdf
    • https://static.usrfiles.com/ugd/eb4c03_2cb908a14f054f60915912c352b2996a.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56966684837.pdf
    • https://cdn.shopify.com/s/files/1/0431/9700/5981/files/currency_trading_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/dajedumokalizadazipodeg.pdf
    • https://cdn.shopify.com/s/files/1/0462/0366/6582/files/appvalley_apk_para_android.pdf
    • https://cdn.shopify.com/s/files/1/0440/9887/9640/files/duwewumejafinumuvike.pdf
    • https://cdn.shopify.com/s/files/1/0438/6009/9222/files/waruwuxabasuma.pdf
    • https://cdn.shopify.com/s/files/1/0434/3247/6838/files/ipc_a_610_acceptability_of_electronic_assemblies.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_off00005c96.bin
405669d49cd6ccf5df4cd485a8f33de52d40e4a44658d85ce6a8e572ca54db45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C96 5608 bytes
font_01_sfnt_off00006f9f.bin
bbcd78ff8da659fa633201c9e5a4feda88e538ae14e7526f9c217abe8205d904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9F 11176 bytes

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