Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d24b78c4071466…

MALICIOUS

PDF

59.8 KB Created: 2020-08-14 07:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9137e95426d435ca240e1d22c7440b6 SHA-1: c5c26da126707fc5b15bbe3613e159d49af74b85 SHA-256: b5d24b78c4071466f26e616fdcbfe53a5fefff952e84271a311ee6481743e34e
150 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The primary malicious URL is https://ttraff.cc/pify?keyword=performing+tracheostomy+care+ati, which is likely used to redirect users to a further stage of the attack. The document body, though heavily obfuscated, contains this malicious URL.

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/pify?keyword=performing+tracheostomy+care+ati
    • http://jodorebe.indysuzukiacademy.org/uploads/1/3/2/8/132814930/35017.pdf
    • http://files.hennafyme.com/uploads/1/3/2/3/132303230/0602b06454.pdf
    • http://files.stpaulsenola.com/uploads/1/3/0/7/130739155/rojafexusam.pdf
    • https://cdn.shopify.com/s/files/1/0450/1143/5670/files/treinamento_de_assertividade.pdf
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/zinijubefewiwudov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/xipofajofo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9195/1769/files/zesol.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3929/files/57722449644.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/todexufisedojotijejezaxir.pdf
    • https://cdn.shopify.com/s/files/1/0438/7222/3387/files/cancionero_infantiles.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42820491308.pdf
    • https://cdn.shopify.com/s/files/1/0433/5026/1911/files/lugiporonidukosoxid.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/duwidomasugubelufatabu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/cambridge_o_level_maths_notes.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_off0000a430.bin
b51a5356b5b9c778875b80f0b0ebfef72b770e0b3fdbfe1e3289abe472da25a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA430 5364 bytes
font_01_sfnt_off0000b648.bin
c4d300e9195004aa67e44c1aa4588eee1624c99470631ebd631d7526ed2865c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB648 14204 bytes

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