Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f9f32eee5af495…

MALICIOUS

PDF

39.3 KB Created: 2020-11-04 10:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 52811be3f630c5a17a2ebf8d4f7e9c3c SHA-1: b82cc45b32c34b94b3f15e411899b854310dade9 SHA-256: c5f9f32eee5af495132db0dc9c3c5156e26b2c3ab86b6767096f8d49b7515b1f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to link farms designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the document is part of a phishing or scam campaign. The document body itself contains obfuscated text and URLs, further supporting its malicious intent.

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://ggtraff.ru/123?keyword=maytag+centennial+washer+service+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5f8a9ff4dcafd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_5f99128220eea.pdfIn PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/demex-ridot-nemewu-jodixosiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5fa24139b550d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444875/normal_5f9dfc73bb111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_5f8c8c1d80665.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/5551592.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/38e111a9-19d2-4f1e-8c02-191130b9f581/25073409819.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/volitoritinosagon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28792712-d8e8-446e-80b0-ef233a630f3f/tekavifefibovakatosi.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/fatalu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB6 5600 bytes
SHA-256: ef0f73824df4bf1ec2fea91b5b725612db3a485bc482cd7f089a6b331f54fb28
font_01_sfnt_off000060af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60AF 9856 bytes
SHA-256: f250a5618a17bd0859a1a2af5cc24cf0842719df5be3f89dbff5ab172d9e13a1
font_02_sfnt_off0000826a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x826A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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