Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b2568c08cfaa4a…

MALICIOUS

PDF

57.4 KB Created: 2020-08-11 15:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2ddfe7ebd95cc9b4619af26d143f6e2 SHA-1: 2f344a4a6784e18acd4a9b83edbc9be67c7aadd8 SHA-256: 73b2568c08cfaa4a3f634fad9d739814274aec928ce4fda556cbd65b4108eeea
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic firing indicating it leads to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=basic+cost+accounting+concepts+pdf
    • http://files.lyndziecherry.co/uploads/1/3/1/4/131407968/8896782.pdf
    • http://bukirovol.drmarkbloom.com/uploads/1/3/0/9/130969162/biramefuxe.pdf
    • http://files.lussoproperties.net/uploads/1/3/1/1/131164081/pojewel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/67033838319.pdf
    • https://cdn.shopify.com/s/files/1/0433/8774/8519/files/nyc_rent_stabilized_lease.pdf
    • https://cdn.shopify.com/s/files/1/0434/8982/0838/files/safe_mode_update.pdf
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/sobitapebafosetumap.pdf
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/introductory_chemistry_zumdahl_decoste_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.pdf
    • https://cdn.shopify.com/s/files/1/0435/4038/1855/files/pofavuti.pdf
    • https://cdn.shopify.com/s/files/1/0438/8601/8712/files/55330303252.pdf
    • https://cdn.shopify.com/s/files/1/0434/0193/7063/files/rofesitivovifigasaxagupi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/gezopixaxofuxaba.pdf
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/13186230444.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5032/files/80038788399.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/admission_form_format_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2746/3324/files/puvepiruzutazow.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_off0000a237.bin
263185822e245ab33ef5b44bed8eb526a1b24ea1c7e0b3c4d636ba983f64671e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA237 5244 bytes
font_01_sfnt_off0000b41d.bin
3b8ced330723e0c92bdcbe445e4a37b9e22fae85f4734443406a0b7c269ba4e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB41D 10604 bytes

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