Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b43751506f8fddc…

MALICIOUS

PDF

41.0 KB Created: 2020-08-13 22:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fc25fdd78526ccbe2e862828f8c13b6 SHA-1: e1a95a259ffa6cdea1e8e5d96b8b22db41dbee1e SHA-256: 7b43751506f8fddcaa232d1235cae3195b3c0a25a99104327f1519e19f6c6cf6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'critical path calendar template'. The presence of a large number of external PDF links, many hosted on Shopify, indicates a potential link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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=critical+path+calendar+template
    • http://jalopowe.lachivphfellowship.com/uploads/1/3/2/3/132302780/pavetitele.pdf
    • http://files.onegatewaycincinnati.com/uploads/1/3/0/7/130775866/gotovuzutirep_rizuxeguvuk_kowapozare_veguso.pdf
    • http://files.fieldsos.com/uploads/1/3/1/4/131438018/segagiba-jazinewafexogir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6215/6702/files/basic_algebra_problems_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77603652905.pdf
    • https://cdn.shopify.com/s/files/1/0437/8211/1381/files/mercedes_benz_c_class_2020_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0431/0604/2023/files/62425914237.pdf
    • https://cdn.shopify.com/s/files/1/0432/9229/5333/files/tozararad.pdf
    • https://cdn.shopify.com/s/files/1/0439/9028/6494/files/renuxisemusilo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0294/files/45287167704.pdf
    • https://cdn.shopify.com/s/files/1/0434/0196/9820/files/hallelujah_cohen_emerson.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/prince2_practitioner_exam_questions_and_answers_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/4470/8245/files/descargar_libro_cerebrito.pdf
    • https://cdn.shopify.com/s/files/1/0432/0418/2173/files/7402968135.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/salibugaxikinatef.pdf
    • https://cdn.shopify.com/s/files/1/0433/4406/8773/files/bsc_maths_1st_year_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/17254883722.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_off0000640d.bin
7487fae4cba102041dc73c43d3c924fbf36ffd1cfd4069e1a01cfda2f2f1f060		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640D 5040 bytes
font_01_sfnt_off000074f2.bin
60dda4811cc4c3b74ad10a079342e652b110b50bd9db6c8b7afed4f083642a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F2 9972 bytes

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