Malicious PDF — malware analysis report

Static analysis result for SHA-256 166892a7e6ad9404…

MALICIOUS

PDF

37.7 KB Created: 2020-08-03 05:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bd6bb16f2abe29dde2e9bf457dce402 SHA-1: 100384562869690e4b3ab19efda00f2cb44c6aa4 SHA-256: 166892a7e6ad94040398164bb0f658691c56c7e0bfd8bbecd4659bdb2b360b36
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content from potentially compromised sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/pify?keyword=ion+profile+pro
    • http://files.integritydetailcookeville.com/uploads/1/3/0/7/130738894/wisigugadewivag-pizomagogomotuv-nowupod-lulurav.pdf
    • http://files.tallsprucefarm.com/uploads/1/3/1/3/131383318/fewof.pdf
    • http://files.destinationapp.co.uk/uploads/1/3/2/7/132710763/e94dbdb996455d.pdf
    • http://files.bethesdawinestore.com/uploads/1/3/0/9/130968934/kimowo.pdf
    • http://files.gckllc.org/uploads/1/3/0/7/130776245/nobawebija.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/31075505860.pdf
    • https://cdn.shopify.com/s/files/1/0436/4835/2406/files/99744733855.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/head_first_python.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/85932613019.pdf
    • https://cdn.shopify.com/s/files/1/0440/7299/2918/files/durmukhi_nama_samvatsara_panchangam_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0787/files/52039123155.pdf
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/41409469969.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/79257371661.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/59272132816.pdf
    • https://cdn.shopify.com/s/files/1/0427/4572/5094/files/filakopukizojaxavu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5739/files/22150176821.pdf
    • https://cdn.shopify.com/s/files/1/0435/5063/8241/files/furunen.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056ff.bin
a13bfb808f204c0fb03c0eea1acbc71a14f8409a65534181688a6e7bd600ea99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56FF 4444 bytes
font_01_sfnt_off0000662a.bin
f4499f0624e7ed47bbdc512d4056a4cb753610227810d56fc0b5a5d69ecfbfdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662A 10540 bytes

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