Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11ad8d30305df1b…

MALICIOUS

PDF

37.6 KB Created: 2020-09-13 10:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0279a4769a488d8caf95b29139ae442b SHA-1: c9c2a4cf2054332887f8ed77922b27b4d50c6af8 SHA-256: c11ad8d30305df1b66ea07f7b4b7cbc08d1e69bb13487650ff2ace92c7280c80
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 critical heuristic indicating it links to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic. The presence of numerous other PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious 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.com/wb?keyword=mrs%20harris%20sydney%20to%20the%20max
    • https://cdn.shopify.com/s/files/1/0432/2285/9943/files/gesikasisalotefirunub.pdf
    • https://cdn.shopify.com/s/files/1/0437/3400/7973/files/gcse_biology_exam_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/2836/4968/files/copyright_transfer_agreement_form_springer.pdf
    • https://cdn.shopify.com/s/files/1/0465/9501/4821/files/specialized_cycling_shoes_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0463/3113/4113/files/worksheet_convert_metric_units.pdf
    • https://static.usrfiles.com/ugd/eaf48f_762c64d74db043e2bc75c2b3e152e67a.pdf
    • https://static.usrfiles.com/ugd/d54300_c883aa27a13e415680cee8b5c305ad41.pdf
    • https://static.usrfiles.com/ugd/3fc21f_10d18b8abcb1406d91632b34d3338cef.pdf
    • https://static.usrfiles.com/ugd/98e2de_99c2295bd1364ce7a8a6ea7202599d24.pdf
    • https://static.usrfiles.com/ugd/ba3095_6a2c37cd9a1c41bca935dc46c683cf1c.pdf
    • https://static.usrfiles.com/ugd/1df9ea_83c58eaa72b04fd992da4274b368318b.pdf
    • https://static.usrfiles.com/ugd/96bf9d_08b206022b2b42548f926d32aee8d5de.pdf
    • https://static.usrfiles.com/ugd/23b571_a0e6d16411b1478ea7470344ea03fddf.pdf
    • https://static.usrfiles.com/ugd/67f5f7_7046d80ef8ed479e942d31d94195d3ad.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_off0000563d.bin
96ea3430768c2bd8fa06fefeb93cf1ac6f5446f7fa9b8e323831ead3c396ff04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x563D 5208 bytes
font_01_sfnt_off000067dc.bin
12557210a231331ac895594d19e167bf34f0bba41e658b8dedafc29fd3c30927		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DC 9968 bytes

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