Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bae977cd6ee889…

MALICIOUS

PDF

43.9 KB Created: 2020-08-13 01:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a20290877831112ab76eb86eb77a7bde SHA-1: 7cae67d33435e07c533a9e479401b7b5aa16ebdd SHA-256: 99bae977cd6ee889d8c270efa994354446d3dfb463cb8e191eb913294260da5f
150 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for delivering malicious payloads or phishing pages. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm for SEO poisoning or to obscure the final destination. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the redirector and the link farm indicates a social engineering attack aiming to trick users into visiting a malicious 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.cc/wb?keyword=medical%20surgical%20nursing%201%20book%20pdf
    • http://gemag.freighthouseconsign.com/uploads/1/3/1/4/131482975/9877497.pdf
    • http://files.thegamblingclinic.ie/uploads/1/3/1/4/131437276/4bd858a73d.pdf
    • http://files.myrtlemoon.com/uploads/1/3/1/0/131071252/31c1133623.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2541/files/elf_bowling_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/keviduwepexisixunasumuxeg.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8539/files/459622952.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/jakede.pdf
    • https://cdn.shopify.com/s/files/1/0431/5486/6337/files/7013784387.pdf
    • https://cdn.shopify.com/s/files/1/0437/9508/7522/files/la_biblia_de_estudio_reina_valera_1960.pdf
    • https://cdn.shopify.com/s/files/1/0439/3703/8494/files/driver_easy_pro_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/8299/7141/files/non_aqueous_titration_notes.pdf
    • https://cdn.shopify.com/s/files/1/0435/5666/7551/files/84154560617.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/wiwogiket.pdf
    • https://cdn.shopify.com/s/files/1/0436/0385/3469/files/95610276835.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/pebupa.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_off00006d40.bin
8d8cb33b6065dfc8679ad367bab53c86594322adb5481dd2be9553110488d7d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D40 5584 bytes
font_01_sfnt_off0000804e.bin
179c8158fcce091e5a44417e133c8b7c7a4aae0e2a980d49f2a0021a7050ad06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x804E 10004 bytes

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