Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca7d57bb4f2cb98…

MALICIOUS

PDF

52.6 KB Created: 2020-07-10 05:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f93fbbd4328346d9de85a0afed5cecd SHA-1: 1e8310c56d2ee846586bc42bc885279ac2c8acb1 SHA-256: 5ca7d57bb4f2cb9835f52df127b6d0822662358d3a04b2b00367a8227dd9cd6d
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 link farm designed to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the document is part of a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

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/wb?keyword=essentials%20of%20stochastic%20processes%20solution%20manual%20pdf
    • http://files.monfortestatesdacula.com/uploads/1/3/2/6/132681002/226bb98.pdf
    • http://files.emilyannestudio.com/uploads/1/3/0/7/130739069/6499902.pdf
    • http://files.lambertparalegalservices.com/uploads/1/3/1/1/131164557/mifimegoredu_pifeg.pdf
    • http://files.nanolab.info/uploads/1/3/1/3/131379749/befuraxigufero.pdf
    • http://files.operationhood.org/uploads/1/3/1/4/131406274/pikutodan.pdf
    • http://files.ttautothunderbay.com/uploads/1/3/1/3/131381612/vinar-majevoga.pdf
    • http://files.steponpoverty.com/uploads/1/3/2/7/132740564/makozemuxuw.pdf
    • http://files.soapbarlounge.com/uploads/1/3/0/7/130776718/luriza_bokitewakikizu_sepipe.pdf
    • http://files.gingertomjasonhutton.com/uploads/1/3/2/6/132695329/9829216.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zivudubu.files.wordpress.com/2020/06/92469273745.pdf
    • https://kipevofi.files.wordpress.com/2020/07/donabumimowefa.pdf
    • https://vixupidiva.files.wordpress.com/2020/07/zitun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17612659915.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077e7.bin
869a8ac445d23a1c3c6f71d307543470bdbfc1c33bbc6987f5bc38015508662c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E7 5232 bytes
font_01_sfnt_off00008980.bin
0ab0f7e09ea4ea239f3f6562c50ff920a34b25c64a8ceefb650d939b743a7a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8980 11056 bytes
font_02_sfnt_off0000af60.bin
7e5569d373da92c4cd3da6e53df1f5c6aa8f0f32fe5b274a4aeffaa38ea50040		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF60 16224 bytes

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