Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b1cda8256d909d…

MALICIOUS

PDF

42.7 KB Created: 2020-08-08 02:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5d56ce8f49aca38e2e241282da5f486 SHA-1: f43ac69437e6decadf70554f1a7f78654febddd6 SHA-256: 54b1cda8256d909d0dbd94ca89e7a7a14082af7790b4c4ee911e682285716117
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.ru/pify?keyword=complete+key+for+schools+2020+pdf', which is presented as a lure for educational content. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the lure text and the malicious redirector 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.ru/pify?keyword=complete+key+for+schools+2020+pdf
    • http://renodip.chicagolandboxers.com/uploads/1/3/0/9/130969060/c705bcb4c7ef83.pdf
    • http://files.mcdes.org/uploads/1/3/1/1/131163737/buwobuxobikosakulilu.pdf
    • http://files.travelwithkalsi.com/uploads/1/3/1/0/131070827/512140.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/mowapawal.pdf
    • https://cdn.shopify.com/s/files/1/0437/8558/4801/files/prosedur_amdal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84602765162.pdf
    • https://cdn.shopify.com/s/files/1/0430/7776/3226/files/59683637764.pdf
    • https://cdn.shopify.com/s/files/1/0435/6630/1343/files/gulp_command_not_found.pdf
    • https://cdn.shopify.com/s/files/1/0433/0674/6011/files/human_anatomy_body_parts.pdf
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/ruralowesajiwabopowogute.pdf
    • https://cdn.shopify.com/s/files/1/0431/8229/3152/files/83414350299.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/8682988645.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6440/files/43060248992.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/45528064999.pdf
    • https://cdn.shopify.com/s/files/1/0434/5954/3192/files/tepasivivuwuwetes.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_off00005d07.bin
932efce7e49889e524bd3f37665227540054d290f6de65a8eabb19d6827ab0aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D07 5532 bytes
font_01_sfnt_off00006fc2.bin
079b4545d5428dc33ae49f371859320178257f4298a90ad95c78c3e73165bbe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC2 15032 bytes

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