Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ba42f00120f98b…

MALICIOUS

PDF

40.2 KB Created: 2020-11-02 01:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2e87d47d38410911752201d849de7112 SHA-1: 2c7fc7ebb9675d153ecce0a78988e9be298df8c5 SHA-256: c9ba42f00120f98b66d296febd07a09264967819138682bb3f8cbe4aeda4667d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to suspicious or disposable domains, indicating a link farm or SEO manipulation scheme. One critical heuristic identified links to known malicious redirector infrastructure, suggesting a potential distribution vector for malware or phishing. The ML classifier also strongly flagged this PDF as malicious.

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=figurative+language+in+i+hear+america+singing In PDF document text
    • https://vadulovoke.weebly.com/uploads/1/3/4/3/134338980/97d5a0b8c767531.pdfIn PDF document text
    • https://vodoxuzet.weebly.com/uploads/1/3/2/6/132681632/562186c.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/a5630540.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/xokav.pdfIn PDF document text
    • https://kujuxase.weebly.com/uploads/1/3/4/5/134584075/07e215df994501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_5f8fe513a4181.pdfIn PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/b13b3e0dcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_5f9916df9e919.pdfIn PDF document text
    • https://loropigofog.weebly.com/uploads/1/3/4/5/134595907/4099827.pdfIn PDF document text
    • https://revibafejinaj.weebly.com/uploads/1/3/4/4/134485322/2559144.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/5453380.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4479a39c-ffaa-4dae-b1a3-6d0c497d18fd/dafaxanatolubibex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed5a548-ab2a-43d1-b579-92a6f925accb/sleeping_mob_command_minecraft_pe.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/my_side_of_the_mountain_full_book.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/pediatric_electrocardiography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87506ee3-6c9c-4b94-b461-3c6fcf66d02f/radiologie_si_imagistica_medicala_ma.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_off00006041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6041 5228 bytes
SHA-256: e1a6774ebefc3e90c3438c7622cc5058f2835a34d2124240cc286a78006c473f
font_01_sfnt_off000071e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71E9 9972 bytes
SHA-256: f5b49a6cb3c5b5271017806a136f01825c36d81ceea599f5c0de7c9992ba95d2

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