Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64d9b685352c018…

MALICIOUS

PDF

41.4 KB Created: 2020-11-04 21:17:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9e92009692c047d174b6159856b945a SHA-1: 97f84cb45e1a9b52933b83f0bcdc96d115eb9c83 SHA-256: a64d9b685352c018d17b9ee67b508fe5df9b2bf4bd6c780ef17f13c4c58d9af0
94 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, specifically 'https://gettraff.ru/123?keyword=solving+literal+equations+worksheet+pdf'. This heuristic, combined with the ML classifier's high confidence, strongly suggests a malicious intent to redirect the user to a harmful site. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://gettraff.ru/123?keyword=solving+literal+equations+worksheet+pdf
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f9804e452750.pdf
    • https://pogabivapiz.weebly.com/uploads/1/3/4/3/134327153/dezoki.pdf
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5f9124e2e6461.pdf
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/53cee7c7f75c2.pdf
    • https://xabisemegebo.weebly.com/uploads/1/3/4/4/134491474/7675680.pdf
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5f979452e65ff.pdf
    • https://cdn-cms.f-static.net/uploads/4426830/normal_5f997cc0bdaea.pdf
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5f93796601fdf.pdf
    • https://cdn-cms.f-static.net/uploads/4414498/normal_5f99cd673bfb4.pdf
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f904592a43cd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/661372fc-ddb3-4993-94ae-4df3f1d81405/2013_amc_10a.pdf
    • https://cdn.shopify.com/s/files/1/0506/9822/3793/files/5670143254.pdf
    • https://cdn.shopify.com/s/files/1/0483/7264/6046/files/rasoduwelaregilun.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_off000060b8.bin
a2f49a3b9673bc82f0f61e1f84b34fbc45794b865638c3df9d52a8555741934c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B8 5748 bytes
font_01_sfnt_off00007455.bin
325d25c2d1cfe2e00f29c9f347e89f13327c8778832fa847cfc2639556cfe3f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7455 10580 bytes

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