Malicious PDF — malware analysis report

Static analysis result for SHA-256 4126ce395bdb4133…

MALICIOUS

PDF

46.8 KB Created: 2020-10-29 18:59:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 50e9905e19c7af74d11323fb51e0847f SHA-1: 438f2d50f21c7eba4a80ed1e0661126664387cd7 SHA-256: 4126ce395bdb41331efb1e5ae41eafed49d8beb3a6246a11ed837a048254ec0d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains numerous embedded links, many of which point to disposable hosting services and redirector infrastructure. The primary URL, 'https://gettraff.ru/aws?keyword=sql+server+architecture+ppt', suggests a lure related to SQL server architecture presentations. The ML classifier strongly indicated maliciousness, and the link farm behavior is consistent with SEO manipulation or hosting malicious second-stage 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/aws?keyword=sql+server+architecture+ppt In PDF document text
    • https://jopomewimedadi.weebly.com/uploads/1/3/4/4/134465277/6b4fbde.pdfIn PDF document text
    • https://turikiripejuz.weebly.com/uploads/1/3/4/5/134501804/4230330.pdfIn PDF document text
    • https://jufopikigon.weebly.com/uploads/1/3/4/3/134309667/2129280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_5f962d5535a20.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/116ec7b6.pdfIn PDF document text
    • https://fisolaxarod.weebly.com/uploads/1/3/4/4/134471724/rigagulupu.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/lafika.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f8753e8a6ed4.pdfIn PDF document text
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/bc89f96d402af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2929/7817/files/kemadatitu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8675/7018/files/73593966012.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3412/3157/files/nefasovezasolesugafaze.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000793e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x793E 5308 bytes
SHA-256: b895f76706fda56846c10d4fe7bb8cfbcea7dd76603bb4c515fccb7ac8d02f50
font_01_sfnt_off00008b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B50 10300 bytes
SHA-256: 5bca7080a3f07199d8ae7c54e54e02bada9f6f63cb2edf67d97b1421606f89f2

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