Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c7aeebd281457c…

MALICIOUS

PDF

48.5 KB Created: 2020-08-26 15:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0187905caa698ff4656b2688c9701c60 SHA-1: 91b05995a4b547b743d2e4b4d58341b0ef710203 SHA-256: c3c7aeebd281457c1a5869de0561e72ea51d4c6fc9e2fad837958a5671db478b
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Spirited Away ost piano sheet music' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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=spirited+away+ost+piano+sheet+music
    • http://files.theprincipalstory.com/uploads/1/3/1/6/131608017/ed05943867aa9.pdf
    • http://lawega.ebantiques.com/uploads/1/3/1/1/131163667/6345053.pdf
    • http://files.sydneynewhorizons.org/uploads/1/3/2/7/132710787/lozaratorepu_tatira.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/canon_eos_70d_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/topug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66541571973.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3581/files/84169839389.pdf
    • https://cdn.shopify.com/s/files/1/0428/7932/0223/files/report_reckless_driver_california.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/nifirudufebitemafirafux.pdf
    • https://cdn.shopify.com/s/files/1/0430/8067/9577/files/18804936320.pdf
    • https://cdn.shopify.com/s/files/1/0437/1356/0727/files/bissell_little_green_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4286/4289/files/girekaxizur.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/bufojumejo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000603d.bin
6200235ebb0904fde19cebd263b1f1a34b6f3b2a1b69ee83b173831865bc2b87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x603D 4700 bytes
font_01_sfnt_off000070a1.bin
dc312091696149d67e37b44feb9841cc8103597f252c158a8e37c58c11920cd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A1 5580 bytes
font_02_sfnt_off0000837b.bin
5c26b00fe64e555332d292dd7d7ff273b45f2d77f6c6ab8e87351dd692e03d91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x837B 15284 bytes

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