Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f0e9907a1b5107…

MALICIOUS

PDF

35.8 KB Created: 2020-08-06 07:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23108c2c3e56870cbc2580d697d9b88b SHA-1: b126d537168bc8b13a6e9095c53e939dcef649fa SHA-256: b0f0e9907a1b5107984f5369e5a79915f9a712dc7063dd1413e171c08cce8c01
154 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to a known malicious redirector and for containing a mass external PDF link farm. The document body contains the URL that triggered the redirector heuristic, suggesting a lure to external content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct execution capabilities.

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=the+barefoot+investor+pdf+audible
    • http://files.kytnpathfinders.org/uploads/1/3/0/7/130775145/5958866.pdf
    • http://files.avinumalkeinumessianicsynagogue.com/uploads/1/3/1/3/131397971/pekurigakosed_zorokifi_givufovazine_begululuba.pdf
    • http://files.ladyteviot.co.uk/uploads/1/3/1/4/131453291/7112315.pdf
    • https://cdn.shopify.com/s/files/1/0428/7715/7542/files/2186701884.pdf
    • https://cdn.shopify.com/s/files/1/0430/8071/2346/files/variables_in_qualitative_research.pdf
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/97163071297.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6191/files/totunaxupujopudobir.pdf
    • https://cdn.shopify.com/s/files/1/0429/5678/3772/files/13885089504.pdf
    • https://cdn.shopify.com/s/files/1/0434/3195/2536/files/internet_explorer_11_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5702/files/suvudexotolizuwejusala.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zutazalurofesavasa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/2947089790.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pesaveput.pdf
    • https://cdn.shopify.com/s/files/1/0435/4713/2068/files/biogeography_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/lewenojirajoxojojexusil.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/sarunupexifupolajoj.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_off00004d2a.bin
80e3c26fcf499575b9ce7883e581003f23c6b9bab8637364e9c006dd9f8881e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D2A 5280 bytes
font_01_sfnt_off00005f18.bin
be42ca887e681bbf9e2289b6235c3676fdab9ce2a76b59759c8c8a35e77765de
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F18 10332 bytes