Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00b36563471da02…

MALICIOUS

PDF

37.1 KB Created: 2020-11-02 14:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6ca9fb14b9a5bac2261ed54dbb264526 SHA-1: bc384b7e0b377c614cae8546c29ea831a337fa30 SHA-256: c00b36563471da022ee4d99812ca885e2975f9ff65366ed83fac6a716d011be7
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file functions as a link farm, containing numerous embedded URLs designed to redirect users to potentially malicious websites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a redirector URL, https://ggtraff.ru/strik?keyword=plank+jr+high+school+oswego+il, indicating a malicious intent to funnel traffic to harmful destinations. 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://ggtraff.ru/strik?keyword=plank+jr+high+school+oswego+il In PDF document text
    • https://nuzaguwimera.weebly.com/uploads/1/3/4/4/134492670/wewoked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5f8d0eb043bee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5f8b07649885e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5f9b6007e8d07.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/893275.pdfIn PDF document text
    • https://zipiluzus.weebly.com/uploads/1/3/4/2/134234939/6537735.pdfIn PDF document text
    • https://moxowikoxub.weebly.com/uploads/1/3/4/0/134096036/6372994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_5f9bd4f009f8b.pdfIn PDF document text
    • https://jilanuma.weebly.com/uploads/1/3/4/5/134522828/2210915.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/f044bf1e-b094-4967-9e3f-00fd48a1c8aa/sebigawalamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21f48cab-2010-480a-a4fe-df6bcfcebe30/13298633315.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3756/4839/files/18783006280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4e18f6-a6bd-4ead-b6de-e1ee6852ab10/organic_compounds_concept_map_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/544b9c50-9b2a-4744-ab43-926db97c98d1/the_political_economy_of_latin_america_economic_growth.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_off00005174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5174 5296 bytes
SHA-256: cfeeda875118808b3dc523ebb9a9671fef2c5d2e2274bd840462c7fb19ca8607
font_01_sfnt_off0000638b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x638B 11004 bytes
SHA-256: f62ff927c93a91a9ea246e26554f65945490b597acaca0f7365b01641d49569b

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