Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a3fc0cc15d1c98…

MALICIOUS

PDF

43.0 KB Created: 2020-08-15 13:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc5a3e8cbff2f42033feda9d8f415448 SHA-1: 17535ccca772735b4d169e2d6fddf181a5f5ad8d SHA-256: b6a3fc0cc15d1c982394fbba1997589b4620cab163db4f97c005f24d7dc0e83e
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-hosted PDFs, which is characteristic of SEO link farm abuse. One of these links redirects to a malicious domain, ttraff.cc, suggesting a phishing or malware delivery attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirector link embedded within the document.

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=column%20addition%20year%203%20worksheets%20pdf
    • http://files.earthoceanherbals.com/uploads/1/3/0/7/130738960/dafezufisa_nelez_vedanidegida_vijafezed.pdf
    • http://files.maximilianlaw.com/uploads/1/3/0/8/130874361/jikawulijek.pdf
    • https://cdn.shopify.com/s/files/1/0431/1197/3026/files/xezexupawimusukidosox.pdf
    • https://cdn.shopify.com/s/files/1/0435/4582/1338/files/wibiniro.pdf
    • https://cdn.shopify.com/s/files/1/0432/1411/0880/files/sesatakogopisirumilok.pdf
    • https://cdn.shopify.com/s/files/1/0428/6827/7415/files/81392620343.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0069/files/digipuvomupetepok.pdf
    • https://cdn.shopify.com/s/files/1/0436/4677/9552/files/biribeki.pdf
    • https://cdn.shopify.com/s/files/1/0430/1222/7225/files/kuzoxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7453/5067/files/twitch_curse_client.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6335/files/zurikalalot.pdf
    • https://cdn.shopify.com/s/files/1/0433/6920/1832/files/kidijogenanorukovusoje.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/45544643097.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/52383370350.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_off00006913.bin
6233f52adc8e1eecdf620d151abfafd3499b93b8c4f80d2627023a8b6bf7f418		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6913 5608 bytes
font_01_sfnt_off00007c16.bin
d378637e57dcb6472cff92cbbab3032b8655b639469922c1ab719a5f85633cf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C16 10352 bytes

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