Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b647da14897a26…

MALICIOUS

PDF

43.6 KB Created: 2020-08-31 09:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdbf71d6ae2a20cf7ea582be86b4a976 SHA-1: 4fa12f8423996cfd78bc61c496e4c9c15a7ba866 SHA-256: c4b647da14897a26ab7429cbc346d2f92043368bb105f052f4f690172d7e0ec9
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=barbarians+at+the+gate+espa%25C3%25B1ol+pdf'. Additionally, a PDF link farm heuristic indicates the document is designed to host numerous external links. The ML classifier strongly flagged this PDF as malicious. The embedded URL is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site.

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/wix?keyword=barbarians+at+the+gate+espa%25C3%25B1ol+pdf
    • https://cdn.shopify.com/s/files/1/0466/2630/8261/files/modelo_de_transbordo_ejercicios_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/watojafenigekikirerojawo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/concerto_aranjuez_trompette_partition.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6320/files/build_a_container_home_step_by_step.pdf
    • https://cdn.shopify.com/s/files/1/0446/8441/1033/files/latest_immunization_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0431/1017/0786/files/kuvigedixusif.pdf
    • https://cdn.shopify.com/s/files/1/0464/2403/1384/files/goaliath_542727_gotek_portable_basketball.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/gifunipewokesutima.pdf
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/98223489358.pdf
    • https://cdn.shopify.com/s/files/1/0428/0818/0895/files/authorize._net_credit_card_numbers_for_testing.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8861538602.pdf
    • https://static.usrfiles.com/ugd/5438e3_5a585d5af2ab43ab8ed9e3c19ea2b3a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_fafa41c826854254940890c10bed8360.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_off00006701.bin
bb21fa755aca35eea81c58f626b02288d590e20a7cec31320a67683dcd7a33f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6701 5704 bytes
font_01_sfnt_off00007a12.bin
f3d3f8e6bdee8c917243c880556cd06221c7d4ad1c9f27d521336ccbe4295a34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A12 11004 bytes

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