Malicious PDF — malware analysis report

Static analysis result for SHA-256 20afbd7b71066c00…

MALICIOUS

PDF

45.8 KB Created: 2020-08-10 20:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 030f67b3c6ec48f6765c41fb9d1bda67 SHA-1: 4a091d2e32b37946ca55d5f980f65bab8eb7ec20 SHA-256: 20afbd7b71066c003dfcf11067bbf180e4c5fee3039d5ee08a0fc7a1c1df6c14
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 benign Shopify domains, but one critical link redirects to known malicious infrastructure at 'ttraff.cc'. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector URL confirms a malicious intent to lead the user to a harmful destination.

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=bronchial+asthma+in+pregnancy+pdf
    • http://files.charishomes.com/uploads/1/3/2/7/132710601/6545090.pdf
    • http://files.childrensartlab.com/uploads/1/3/0/8/130813827/5194585.pdf
    • http://files.nectrathletics.com/uploads/1/3/0/9/130968962/820645.pdf
    • http://files.corvetteslimited.com/uploads/1/3/1/4/131406717/demib.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/anna_and_the_french_kiss.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/47202860203.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/665013479.pdf
    • https://cdn.shopify.com/s/files/1/0433/5756/9176/files/wimuseridodisuvedebibefol.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/8262132220.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0177/files/93573175769.pdf
    • https://cdn.shopify.com/s/files/1/0438/4283/0496/files/gewibubiseb.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/24371194559.pdf
    • https://cdn.shopify.com/s/files/1/0433/9856/1957/files/antenna_and_wave_propagation_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8515/files/a_history_of_anthropological_theory.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6295/files/gokepadotima.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_off00007516.bin
588e5473bd7fc7fed6f15f349a86ab596b6a43fde028a02d99f0b91de5fcd0ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7516 5720 bytes
font_01_sfnt_off00008860.bin
1d6757ea7a6027e0d2c1002bb9dd9f8452b31eb6ff2944aa416506ddded9037c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8860 10000 bytes

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