Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad515096e5ae7ae6…

MALICIOUS

PDF

44.2 KB Created: 2020-08-14 12:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9aefe2d9f6d89a06333a0e5d6cd3d9a SHA-1: e156f8e523fbc4f62ad8a944404a1f31ce229be5 SHA-256: ad515096e5ae7ae6da22c7e5d9a67e86811349479bb12c76fffe87159004611d
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=balance+sheet+analysis+format+excel', which is also present in the heuristics. The PDF also features a large number of embedded links, many hosted on Shopify, suggesting a link farm or redirection strategy to obscure the ultimate malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=balance+sheet+analysis+format+excel
    • http://files.eventfullyourscharleston.com/uploads/1/3/0/7/130739779/c78a2e4e3b.pdf
    • http://files.mascaretbay.com/uploads/1/3/2/8/132815008/3151665.pdf
    • http://files.peterdarley.com/uploads/1/3/0/9/130969689/bapepesovido.pdf
    • http://files.portsmouthacupuncture.org/uploads/1/3/2/7/132712207/lipabusalevuw-mamoxajov.pdf
    • https://cdn.shopify.com/s/files/1/0434/4188/1254/files/lake_chapala_restaurant_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/87659588567.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/sobevovuxogakitikozu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/lewiteku.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2661/files/45506740684.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7992/files/99444904976.pdf
    • https://cdn.shopify.com/s/files/1/0434/2140/1237/files/11823636009.pdf
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/kekolaxir.pdf
    • https://cdn.shopify.com/s/files/1/0439/0957/8904/files/lease_contract_sample.pdf
    • https://cdn.shopify.com/s/files/1/0439/2134/2619/files/didavaka.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3799/files/evidence_based_decision_making.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/22909992834.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.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_off00006ef6.bin
729a079586ec61b94d9cd9b5cdc3ab9db3cd28dbfb2eeeda2b1273f4dd057d81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF6 5340 bytes
font_01_sfnt_off000080f6.bin
3aabbad8f7aa0b84afac725fbbf58381dc8af4aa93b5c9d58913d3d8e414455a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F6 10128 bytes

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