Malicious PDF — malware analysis report

Static analysis result for SHA-256 9621e6d62028f270…

MALICIOUS

PDF

51.8 KB Created: 2020-07-30 14:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d83c1352e87950e4314b37592512b3d SHA-1: a38c14b3a70a721b5d0746edf9afee70ff42a62a SHA-256: 9621e6d62028f270cb5af1f84cfad8def1c39bb8e1060733bc6347c58bff6155
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links to external websites, including a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, appears to be related to educational worksheets, suggesting a lure. The presence of PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics strongly indicates a malicious intent to redirect users to harmful content. The ML classifier also flagged this PDF with high confidence.

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.
  • 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.com/pify?keyword=multiplication+and+division+worksheets+year+5+pdf
    • http://files.mosaicoflight.com/uploads/1/3/1/3/131379231/vujejokijufiwiw_gobes.pdf
    • http://files.draytonparish.org/uploads/1/3/1/0/131070618/numagofalasumuv.pdf
    • http://files.siboprocourse.siboinfo.com/uploads/1/3/1/3/131398428/xixegukurifoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/36416418428.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6690/files/67379680838.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3708/files/wozetij.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/97636789764.pdf
    • https://cdn.shopify.com/s/files/1/0428/1306/3327/files/55430066564.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8850/files/gepusuponevogevaxutut.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/3869665592.pdf
    • https://cdn.shopify.com/s/files/1/0433/0710/6462/files/46179409452.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1518/files/fezuli.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8503/files/40132575759.pdf
    • https://cdn.shopify.com/s/files/1/0433/7310/1219/files/xasoxev.pdf
    • https://cdn.shopify.com/s/files/1/0435/7718/0328/files/xeginofiv.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_off00008b82.bin
150b2d3308c355897fc82bda15dbe90f19b51f3ef39882769b51a6de2b51b64f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B82 5572 bytes
font_01_sfnt_off00009e8c.bin
90d65fd4de73c40560207e62d1405c89a2e55e8842ec34ea529f93c8d649a1ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E8C 10208 bytes

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