Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8e31d8748161c9…

MALICIOUS

PDF

45.4 KB Created: 2020-08-31 03:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03f6f29d926c6d3da6ac2789fbd232f9 SHA-1: e11d35bc944c029af78ddd8810230ea9464a2787 SHA-256: cd8e31d8748161c951ded5b38b4456469d993ecca515b0561dd748b197a62a42
150 Risk Score

Malware Insights

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

This PDF file contains a high number of embedded links, with one pointing to a known malicious redirector (ttraff.com). The majority of links point to PDFs hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing a mass external PDF link farm. No scripts were extracted from this sample.

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=ponle+la+cola+al+burro+dibujo
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/lukodavitibed.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/add_png_to_jspdf.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0293/files/zifijalujigofu.pdf
    • https://cdn.shopify.com/s/files/1/0448/0778/2557/files/redao_texto_dissertativo_argumentativo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/94604011725.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/nasugikado.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/82122631383.pdf
    • https://cdn.shopify.com/s/files/1/0458/6271/5545/files/century_powermate_70_welder_manual.pdf
    • https://cdn.shopify.com/s/files/1/0454/1176/2344/files/75735705188.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8325/files/maths_teacher_cv.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/4750847632.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/18801925045.pdf
    • https://static.usrfiles.com/ugd/b8c837_b52de928a3dc467795c003702e94c2be.pdf
    • https://static.usrfiles.com/ugd/850f07_cd40b47d328f4a0fa86e9b7b180a385b.pdf
    • https://static.usrfiles.com/ugd/b8c837_51f91282f8f0441cb91ac0cf1d6150b3.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_off0000723c.bin
a6596b311329a3ab2ec301c8e411287a70105c7427f05d859790b4bf5cfcf5d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x723C 4972 bytes
font_01_sfnt_off00008325.bin
1c3a90670ac848d675c4a0f0cf0ebe7a36b94048c534f5d41fcabd0df246ea9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8325 11132 bytes

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