Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb55a5f34288fc3d…

MALICIOUS

PDF

58.1 KB Created: 2020-08-11 13:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acce68c0336929f6a78deda2433588a5 SHA-1: 146b81f71908a75e9fb634ceb7d5ab705a97c345 SHA-256: fb55a5f34288fc3dc3c35417ba8699902821921a29c1f9cf6004b6d792109960
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains this URL and other links, suggesting a phishing or redirection attempt. The presence of multiple embedded links, many pointing to Shopify domains, indicates a link farm strategy to obscure the ultimate destination. The ML classifier also strongly flagged this PDF as malicious.

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=causes+of+deterioration+of+concrete+structures+pdf
    • http://medazuboj.westside-church.com/uploads/1/3/0/8/130814328/5128926.pdf
    • http://files.realbostonian.com/uploads/1/3/1/4/131406885/4123006.pdf
    • http://files.slang4201.com/uploads/1/3/0/7/130739916/96ebe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/tisimapufolekolavemo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4115/1386/files/kiloriwep.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/15065458136.pdf
    • https://cdn.shopify.com/s/files/1/0438/3136/1686/files/analise_sintatica.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/treatment_of_abnormal_behavior.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9714/files/63552531150.pdf
    • https://cdn.shopify.com/s/files/1/0433/0897/4235/files/66522886071.pdf
    • https://cdn.shopify.com/s/files/1/0452/6581/3666/files/oxidation_and_reduction_reactions_organic_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/square_root_of_13.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/tufas.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/mopiwolipelesafu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/bruno_munari.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_off0000a78b.bin
687563d3c7237f8646a35cace5b51599f3460ddfdd23c1cd6a93a40faf94366e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA78B 5024 bytes
font_01_sfnt_off0000b8ad.bin
3c1e22ad3222d5f00d3b81cc9bea9ee4d4eda6cb4443367d25526b3d1b78eaf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AD 10116 bytes

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