Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5b58f0ad695ffc…

MALICIOUS

PDF

41.4 KB Created: 2020-07-31 14:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1221dbc352bd2718c59f7954ae4b412 SHA-1: 3b850a2e81a21cfbcdd988879e8849646d69d827 SHA-256: bf5b58f0ad695ffc39f74f7af152830964ff2667f7cea380991cdf17928d5168
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link pointing to ttraff.com, which is flagged as malicious. Additionally, it hosts a large number of external PDF links, many of which are hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for malicious purposes.

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=southampton+map+pdf
    • http://files.petanquepb.com/uploads/1/3/0/7/130776462/9843802.pdf
    • http://files.juliemorganbooks.com/uploads/1/3/2/8/132815220/riseg-lijuf-legagujedazis-dokapagido.pdf
    • http://files.ethanrmarshall.com/uploads/1/3/1/3/131398099/1336682.pdf
    • https://cdn.shopify.c
    • https://cdn.shopify.com/s/files/1/0434/5384/1560/files/55101159552.pdf
    • https://cdn.shopify.com/s/files/1/0438/6072/1829/files/sizimuwugavif.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/29461506595.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/68626552189.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0759/files/sofafebifame.pdf
    • https://cdn.shopify.com/s/files/1/0431/9500/7137/files/41871402173.pdf
    • https://cdn.shopify.com/s/files/1/0438/3227/9190/files/nivazonawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5676/files/13580049801.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/dubitowoxaxexuji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/visaboxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1928/0288/files/61566691961.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/52617276496.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/tizuzukeputowopeza.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_off000066c9.bin
826e8e19e092daaa2dd04f0fc58aff06d143bcc78d685ae62366d6b31c5466f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C9 4792 bytes
font_01_sfnt_off000076e9.bin
3650e8fab8941896c81c89d4744af22d34224888e65c7253f4a08fb0210657f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E9 9916 bytes

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