Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b898e84dc660d4d…

MALICIOUS

PDF

35.2 KB Created: 2020-08-22 15:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a49d92ddd5cc657dfcf5515168d816f8 SHA-1: 4b30196300a12aa09dbc4b6749205f61a87cde90 SHA-256: 9b898e84dc660d4d290ac54f60023c39bcff5b6bddfbb7b9d41449a626de6a0d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.com). The document body, though heavily obfuscated, contains the text 'Auxiliary verb worksheet with answers' and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF was flagged by a machine learning classifier and heuristics indicate it is a malicious redirector and part of a link farm.

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.com/pify?keyword=auxiliary+verb+worksheet+with+answers
    • http://files.sbinfreedom.com/uploads/1/3/2/7/132740343/d77af9.pdf
    • https://cdn.shopify.com/s/files/1/0432/1551/9912/files/adobe_acrobat_pro_crashes_when_opening.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/9124666200.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/the_hobbit_graphic_novel.pdf
    • https://cdn.shopify.com/s/files/1/0437/7722/8957/files/modoxesizavep.pdf
    • https://cdn.shopify.com/s/files/1/0434/7183/1193/files/80436605106.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/moselojufofipolagepeva.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0297/files/pdf_file_convert_to_word_online_zamzar.pdf
    • https://cdn.shopify.com/s/files/1/0436/1938/5502/files/pujiminilosedetopekobu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6917/8017/files/70021917150.pdf
    • https://cdn.shopify.com/s/files/1/0431/0096/2977/files/dividosinaxoniwuten.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9385/files/30912551984.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3138/files/fewapubaxe.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_off00004cea.bin
9de3ee3ec35d954bfcd9bc45d0303401c45278c544eac9c964a258ec10f62fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CEA 5288 bytes
font_01_sfnt_off00005ef0.bin
bfd2eb927e704968a6a97f50ac3e9f13c8751d0ecdaca27b223bc93ca82b61ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF0 9928 bytes

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