Malicious PDF — malware analysis report

Static analysis result for SHA-256 f859c5034976d8cf…

MALICIOUS

PDF

39.7 KB Created: 2020-08-07 08:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceb5196048e7fd2a9e704db0c3ffbd06 SHA-1: 2906bd74b524ea13b2f0a2bdded8aaa5ba08ee32 SHA-256: f859c5034976d8cf17181ac1489e5b7dac71f36089c89eb612507771b09126d7
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body and embedded links also indicate a lure related to PDF conversion tools. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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.ru/pify?keyword=online+pdf+to+word+converter+multiple+pages
    • http://files.natanson-art.com/uploads/1/3/1/4/131483214/xiziwibuponutu.pdf
    • http://dekumina.whitehorsevenue.com/uploads/1/3/1/8/131872225/935228.pdf
    • http://files.cpcaannualconference.com/uploads/1/3/2/6/132682171/9775224.pdf
    • http://files.socohomephotography.com/uploads/1/3/2/6/132695339/sunapogukila_lakeligo_bifasojusunoxe_tupugexex.pdf
    • http://files.nicolejonesdevelopment.com/uploads/1/3/2/7/132740408/rakugodufosodajejiw.pdf
    • https://cdn.shopify.com/s/files/1/0441/3577/6408/files/brother_dcp_l2540dw_specs.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/sumuta.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/bedaxisemegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/jorolipezubenuza.pdf
    • https://cdn.shopify.com/s/files/1/0432/0565/6736/files/putifilaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54729765263.pdf
    • https://cdn.shopify.com/s/files/1/0435/7462/4419/files/29941158809.pdf
    • https://cdn.shopify.com/s/files/1/0437/7542/6722/files/wivubepelurumuluzoginebu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/tipos_de_aflatoxinas.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/linux_awk_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/2630/8510/files/90099374799.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/76782403404.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_off00005c76.bin
727b738cdf86cc159a572d56dc05a3cbc1f0da34a40cddfc5397b7adc0779ef5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C76 5656 bytes
font_01_sfnt_off00006fb1.bin
d047cf7108becad56d4956295ee4f2d0ed48ce0a5c6cf51005722f699c0da437
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB1 9980 bytes