Malicious PDF — malware analysis report

Static analysis result for SHA-256 320da9075996e6a3…

MALICIOUS

PDF

49.2 KB Created: 2020-07-17 08:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d257b3c4759d375480a26e3c7dfb68b6 SHA-1: 898aa86d504bcc74629003c360676e3fb1376692 SHA-256: 320da9075996e6a34a956cd956694d5f6052b439360d534d15200697cd0530d3
212 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external links, many of which point to WordPress hosted PDFs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-9268608-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9268608-0
  • 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/wb?keyword=vaillant%20boiler%20manual%20ecotec%20plus%20837
    • http://files.mikesbrass.com/uploads/1/3/0/9/130970015/zegameluwona.pdf
    • http://files.jbd-footwear.com/uploads/1/3/2/3/132303226/sisonulim.pdf
    • http://files.lemonteilrevolution.com/uploads/1/3/0/7/130775959/9121624.pdf
    • http://files.asmorangecoast.com/uploads/1/3/0/7/130738823/nodofofubofexij_feromarasamen_vamulejo.pdf
    • http://files.ron-warren.com/uploads/1/3/1/1/131163514/tawigiz.pdf
    • http://files.asmorangecoast.com/uploads/1/3/0/7/130738823/nodofofubofexij_
    • https://mamonuno.files.wordpress.com/2020/07/nanavoluvoguxidolijidaba.pdf
    • https://mumovesutaj.files.wordpress.com/2020/06/68691545576.pdf
    • https://lareberu519560336.files.wordpress.com/2020/06/jidaxepururagutubakele.pdf
    • https://solanimozo.files.wordpress.com/2020/07/4358287405.pdf
    • https://tezojukoj.files.wordpress.com/2020/06/99319626064.pdf
    • https://jatipeku.files.wordpress.com/2020/07/52354282885.pdf
    • https://vonizubu.files.wordpress.com/2020/07/jekurasutanurazu.pdf
    • https://sajaxuf.files.wordpress.com/2020/07/36835772475.pdf
    • https://donikurala.files.wordpress.com/2020/07/kumopaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/midotikonujeriruzopa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/988421284.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/lasegibazavusuwefi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/61875372480.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1272/files/nobenapomenegil.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/rilufabukenanujejukepi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94393320092.pdf
    • https://cdn.shopify.com/s/files/1/0434/5584/0409/files/modavipemuvoxe.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_off00007954.bin
d7323737c9a61d43545d1ad0148c5a1add8ec962e1e94585bb500ac7429ff1f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7954 5504 bytes
font_01_sfnt_off00008be8.bin
4be7e8ce203a94731379c065f314cc71b17c339e759e30b6ad50155a5ec4c3ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE8 13472 bytes

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