Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a1c7c8630bea58…

MALICIOUS

PDF

41.7 KB Created: 2020-08-05 05:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a77fd960f6e758054d2ce5acd8e12330 SHA-1: e242e2d6beccf768c84ea188e7f443f6f6877383 SHA-256: e8a1c7c8630bea58d659b63b4237beb07de794004ceedb705cb7ccd5fa77aaf7
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. This indicates a link farm or redirection attack designed to lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=alfonsina+storni+poemas+pdf
    • http://nijet.hartfordcathedral.org/uploads/1/3/1/3/131383791/tapop.pdf
    • http://boleras.sage-and-selah-organics.com/uploads/1/3/1/4/131483254/rekujito.pdf
    • http://files.darajamesdesigns.com/uploads/1/3/0/7/130739648/8515419.pdf
    • http://files.flexgridapp.net/uploads/1/3/2/6/132680813/lomumoxosuvamudepib.pdf
    • https://cdn.shopify.com/s/files/1/0433/4528/1183/files/midezidiragaledezamanu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6918/files/52936408784.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37394074323.pdf
    • https://cdn.shopify.com/s/files/1/0428/7181/6358/files/pinifafiperudu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9206/files/lexiganekevovipobo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0725/files/87960739219.pdf
    • https://cdn.shopify.com/s/files/1/0428/7417/5644/files/calculus_crash_course.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/47273840066.pdf
    • https://cdn.shopify.com/s/files/1/0437/8089/8973/files/51739845453.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5031/files/34621714678.pdf
    • https://cdn.shopify.com/s/files/1/0431/7803/3313/files/75789830006.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/vexotazivukajudiku.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7423/files/kuzakunowugog.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_off00006640.bin
d7fae7bfcf149ab3c06a87d08bde37625a2d8ecce071a75d3c432a660ba39dff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6640 5176 bytes
font_01_sfnt_off000077c9.bin
394579c40b67bc4e9b82d69c8daaa5834615ffc8cb143b7f08be96451e1b79df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C9 10128 bytes

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