Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc06d12f8bac0d6…

MALICIOUS

PDF

49.0 KB Created: 2020-08-29 05:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3dc49a576ed0e47b664c6828bd7cfaa SHA-1: 85c3d88d4913aa6cd7dfcaffb8c197b567e484a1 SHA-256: bfc06d12f8bac0d6a64327be6b7ed573cde1cfd25e7888380532b3db9b0e12ae
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text referencing 'The hundred-page machine learning book' and includes the malicious URL. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links to external PDFs, some of which are hosted on Shopify. The primary malicious URL is the most critical IOC.

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/wix?keyword=the+hundred-page+machine+learning+book
    • https://cdn.shopify.com/s/files/1/0432/1571/6519/files/kibetotufatefekozojizajuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/6798/8376/files/f_b_service.pdf
    • https://cdn.shopify.com/s/files/1/0428/6224/8102/files/jodolapomujuniluwutofa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0937/5397/files/26754358484.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5207/files/ciencias_naturales_bachillerato.pdf
    • https://cdn.shopify.com/s/files/1/0437/3194/3585/files/latasodewugasibapaxin.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/papowi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4646/0840/files/basisuvobojikuwusutilow.pdf
    • https://static.usrfiles.com/ugd/b8c837_9739dc1acc38414c9df0e5c4031d5b43.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd5c1e5383ec4a6cb593011b71e4da39.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/99703166032.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/ronevotavi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7023/4519/files/ascending_aorta_fusiform_aneurysmal_dilatation.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_off00007f16.bin
22495cf5b64241bf29dde0d255435f391e88561934926ded40741dab4bc44047		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F16 5496 bytes
font_01_sfnt_off00009194.bin
2267df0b1fcec1f59dd3dd331c1f7ef3ebbcc619bd70a5e14d0be8e34ef7316c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9194 11120 bytes

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