Malicious PDF — malware analysis report

Static analysis result for SHA-256 91526e11febae724…

MALICIOUS

PDF

41.9 KB Created: 2020-08-26 14:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96c18e59f37928cd3d0e5bbec467d814 SHA-1: e441a114a02e674100b7add78fcefc72be0ba403 SHA-256: 91526e11febae7244b4e7e6f0ec3ee82faf3096f28c2de43ff7c6972a47f3096
150 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding numerous external links. One of these links, 'https://ttraff.com/pify?keyword=b+long+artwork', is identified as a malicious redirector. The presence of many links, including this malicious one, suggests an attempt to lure users to potentially harmful sites, possibly for phishing or malware distribution. 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.com/pify?keyword=b+long+artwork
    • http://files.agileequinebodywork.com/uploads/1/3/1/3/131379759/gojapotatib_zazig_wusamubove_sixawewenop.pdf
    • http://files.dallasmoderne.com/uploads/1/3/2/6/132681296/5f99ecce1.pdf
    • http://kolokizu.windycityknittingguild.com/uploads/1/3/1/4/131453060/3233703.pdf
    • http://files.hausmusiknz.com/uploads/1/3/1/4/131409309/2805670.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8469/files/livros_de_carlos_marighella.pdf
    • https://cdn.shopify.com/s/files/1/0449/8302/5823/files/98071492320.pdf
    • https://cdn.shopify.com/s/files/1/0448/2210/2173/files/chaim_potok_my_name_is_asher_lev.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3873/files/majakekufesodovelogudu.pdf
    • https://cdn.shopify.com/s/files/1/0441/1473/9352/files/fotagubejovojim.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4481/files/acl_repair_rehab_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/15302736477.pdf
    • https://cdn.shopify.com/s/files/1/0437/4318/2999/files/45309634450.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/25599611465.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/19647572384.pdf
    • https://cdn.shopify.com/s/files/1/0432/0716/4064/files/65514030497.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_off0000662e.bin
75784ecc241271eb90a7b83fa8c21a5370c880e670d780001e72020235c5b4ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662E 4880 bytes
font_01_sfnt_off000076ed.bin
330c3fb362bb16ac19079967dd4cd4d982c206efbced0b12d542e173ddf37cd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76ED 10580 bytes

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