Malicious PDF — malware analysis report

Static analysis result for SHA-256 430d03ac65746fcf…

MALICIOUS

PDF

42.7 KB Created: 2020-08-05 05:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d28eac6a667a37d06207187e8c310d5 SHA-1: 3e0960be1212ab62d0bc65feb88b71f0dd9517b8 SHA-256: 430d03ac65746fcf85788cc3b15d1b2dac75ec43e12ab6b32aadbed27842e8fb
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on Shopify. This suggests a link farm or redirection tactic to obscure the ultimate malicious 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=spider+web+graphic+organizer+pdf
    • http://files.4elements1.com/uploads/1/3/1/3/131380297/libala.pdf
    • http://files.katycupcakes.com/uploads/1/3/2/6/132695339/zamen.pdf
    • http://files.meritcoffeetogo.com/uploads/1/3/0/8/130874254/3851829.pdf
    • https://cdn.shopify.com/s/files/1/0438/3450/7426/files/daxasetuxalunim.pdf
    • https://cdn.shopify.com/s/files/1/0433/7739/3815/files/21011063931.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/hvac_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/96382461576.pdf
    • https://cdn.shopify.com/s/files/1/0437/4229/8264/files/xonupoda.pdf
    • https://cdn.shopify.com/s/files/1/0432/8059/7152/files/38885316618.pdf
    • https://cdn.shopify.com/s/files/1/0437/2771/6520/files/vuxavutetew.pdf
    • https://cdn.shopify.com/s/files/1/0434/0210/0886/files/labawanubaji.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/vavuwodovejizej.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6721/files/43446283519.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9335/files/traditional_approaches_of_marketing_pdf.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_off00006899.bin
abfeaffd67b1660353a7af8b2107b329709707868ffe5b148a7d2a85900296a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6899 5592 bytes
font_01_sfnt_off00007bb5.bin
98cf35f10be7844dd2282f16c602dbfe27fb53c82f658274144960ec589c5d3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB5 10156 bytes

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