Malicious PDF — malware analysis report

Static analysis result for SHA-256 74753e1ad0c1d3ba…

MALICIOUS

PDF

72.1 KB Created: 2020-08-09 13:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f1662a9ac43bb3b9f1bd02fa1584255 SHA-1: a034fc220706b6775ad1a436a91203bb0c03aff5 SHA-256: 74753e1ad0c1d3ba549087331912e7c9f2a701de036e5b75170b49910bf18372
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics, suggesting an attempt to disguise malicious content as a legitimate PDF.

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=castellano+o+espa%25C3%25B1ol+pdf
    • http://files.meggiesdistillery.com/uploads/1/3/1/8/131871633/1d9dc8f64c.pdf
    • http://nadur.hopewarmingpontiac.org/uploads/1/3/1/4/131438464/13cec5cdce5ba.pdf
    • http://files.bullbearkidsbooks.com/uploads/1/3/2/6/132681404/medewesiposade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39858795743.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/pijorujamifonozoto.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0439/4529/6027/files/organic_chemistry_acid_base_practice_problems_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4870/files/metric_bolt_size_chart_uk.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9146/files/10008175375.pdf
    • https://cdn.shopify.com/s/files/1/0431/8730/6658/files/icarus_and_daedalus_story.pdf
    • https://cdn.shopify.com/s/files/1/0431/6646/6216/files/73703181640.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/wondershare_editor_getintopc.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/ganewolubopoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/83035760677.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/35010499232.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce1d.bin
4df0a0180524d59e9c1bee3479d43e8e8248c07a9e95aef12b22731eb4b80fee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 4916 bytes
font_01_sfnt_off0000dea3.bin
0516c1c9bb970d2fe785f8106a7226a47bff4f00723adade08ea8899797fc401		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 11264 bytes
font_02_sfnt_off00010390.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 4324 bytes

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