Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a97a86cf4c4203…

MALICIOUS

PDF

40.7 KB Created: 2020-08-16 20:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 865c2e523083767a1103e1e59992f128 SHA-1: cad169f2558f3495c5aa0f9800987d624f64b56a SHA-256: 98a97a86cf4c42033b233a413b84f385ef3e7533a228d51061eaf8199d7bbcfe
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.ru/pify?keyword=bilinear+transformation+in+matlab+code', suggesting an attempt to lure users to malicious content. Another heuristic flagged a large number of external PDF links, indicating potential SEO manipulation or a broad phishing campaign. The document body itself is largely unreadable binary data, but the presence of the malicious redirector URL is a strong indicator of malicious intent.

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.
  • 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.
  • 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=bilinear+transformation+in+matlab+code
    • http://files.themassageplaceop.com/uploads/1/3/2/6/132696500/zinowejebire.pdf
    • http://files.gracewithlight.com/uploads/1/3/0/7/130739835/8472973.pdf
    • http://nadati.jrleadershipflorencecounty.com/uploads/1/3/1/0/131069934/8572317.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/99002981772.pdf
    • https://cdn.shopify.com/s/files/1/0440/1581/2773/files/tizatenubomemerodubigof.pdf
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/tatawutuzuzi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/answers_of_history_class_9_chapter_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/abbyy_transformer_2._0_pro.pdf
    • https://cdn.shopify.com/s/files/1/0433/1424/9886/files/juxorobupe.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/pejixepexomituvobituba.pdf
    • https://cdn.shopify.com/s/files/1/0439/1721/3851/files/warranty_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0430/4093/1991/files/bipidag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruwofejimu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e61.bin
5baba386684220a88e67e1413fcaebbe96df60c583dd4b27ed70d5304c13f23c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E61 5356 bytes
font_01_sfnt_off0000706d.bin
f5e87374a6b25856d11f6f097b2d54a806fc142bcb98eca24fde3dd3e9055657		 pdf-font-stream PDF embedded font (sfnt) at offset 0x706D 11060 bytes

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