Malicious PDF — malware analysis report

Static analysis result for SHA-256 035c26624c1db160…

MALICIOUS

PDF

62.4 KB Created: 2020-08-31 07:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: feb5b20b5acbaee20073bd654f92cc7d SHA-1: 25c8f22d4934d9d63664884e927c23c975615607 SHA-256: 035c26624c1db160ebc7afc7a539e9173efa9a884b305285c1875c1706b82607
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector URL known for malicious activity. The document body, though heavily obfuscated, contains the primary malicious URL and appears to be a lure for academic content. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to host a link farm.

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/wix?keyword=nouveaux+programmes+sciences+cycle+3
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/bujarodelekopujizav.pdf
    • https://cdn.shopify.com/s/files/1/0432/8967/3888/files/32597354751.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.pdf
    • https://cdn.shopify.com/s/files/1/0437/7529/5640/files/ideology_of_pakistan_notes.pdf
    • https://cdn.shopify.com/s/files/1/0435/8258/7039/files/ansys_boundary_conditions.pdf
    • https://cdn.shopify.com/s/files/1/0465/1188/2398/files/givikakavi.pdf
    • https://cdn.shopify.com/s/files/1/0461/4271/8115/files/34063492231.pdf
    • https://cdn.shopify.com/s/files/1/0429/5006/6339/files/jivupak.pdf
    • https://cdn.shopify.com/s/files/1/0433/3964/5093/files/79840933888.pdf
    • https://cdn.shopify.com/s/files/1/0428/6028/2023/files/29793781464.pdf
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/87660130147.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_off0000b156.bin
7d44152659b081a8f56d68bfcccab4b7317cb75b005de1f57c7ce490d352fe99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB156 5616 bytes
font_01_sfnt_off0000c473.bin
890200d7a07e9cebadb43dc4c0ed40443f07123c5a3b4d064b55582d5953d86b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC473 12440 bytes

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