Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bff019f198b4616…

MALICIOUS

PDF

45.6 KB Created: 2020-08-11 14:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9ce5dc0b96ba60cedf9b27c92b1a06f SHA-1: ad722b382058698fe73686dfc664d518f4b9f1e1 SHA-256: 8bff019f198b46169870f762936501a6566c0f60d8651e67988b3a5b1476da09
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links, characteristic of a link farm. One of these links, pointing to 'ttraff.ru', is identified as a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous Shopify links likely serves to obscure the malicious redirector within a large volume of seemingly benign content.

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=barorreceptores+de+baja+presion+pdf
    • http://files.kwebsterglass.com/uploads/1/3/2/6/132695551/1203027.pdf
    • http://files.lydiamartinstudio.com/uploads/1/3/0/8/130814676/b23e7.pdf
    • http://files.antonianhonors.com/uploads/1/3/1/1/131164081/f67f59dee24.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53059057271.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/59166744871.pdf
    • https://cdn.shopify.com/s/files/1/0439/0954/6136/files/42812606499.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/vijigogalasisibezunikug.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/kesuwafifubet.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2758/files/58894519355.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32150460784.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/42356771426.pdf
    • https://cdn.shopify.com/s/files/1/0437/5068/6874/files/nubewojukuxaxumuberaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/54669910661.pdf
    • https://cdn.shopify.com/s/files/1/0438/3303/2864/files/all_notsobot_commands.pdf
    • https://cdn.shopify.com/s/files/1/0444/0326/1606/files/analysis_of_swot_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/foxuwidelipafaweni.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_off00006e46.bin
6f80427f6c073d118e66f0e310c9564ce2638fc1859c1e6c7be305ad5bcc626d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E46 5380 bytes
font_01_sfnt_off0000809e.bin
0412d220057d12ef5c368b8fe33c2f15449737ff1f68c1fb70035b79b3eeff8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x809E 12848 bytes

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