Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ae73b2cb20e825…

MALICIOUS

PDF

45.9 KB Created: 2020-10-27 01:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1a43f4aedcaadf4fd152d9be86ff033f SHA-1: 91c47144cf3587bd46eb5dccf946bf672a9b27e9 SHA-256: c6ae73b2cb20e825ba4ce0532c73582efde0a91082da0c112e3602e3613560c6
200 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDFs hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/123?keyword=free+service+manual+downloads. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests an attempt to lead users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/123?keyword=free+service+manual+downloads In PDF document text
    • https://desaviguwogo.weebly.com/uploads/1/3/1/8/131871994/5037129.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/fubisi.pdfIn PDF document text
    • https://welavofewefose.weebly.com/uploads/1/3/0/8/130813025/fetak-bakodosuvod.pdfIn PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/2e4c9adc05775c4.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/tidivobinimigip-banez-batipafon.pdfIn PDF document text
    • https://gowewibejeji.weebly.com/uploads/1/3/4/4/134481286/bataluxi.pdfIn PDF document text
    • https://xutifivaluladar.weebly.com/uploads/1/3/4/3/134337767/dc10de7ee5a7d.pdfIn PDF document text
    • https://bikipejuroninoj.weebly.com/uploads/1/3/4/4/134448394/3416110.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/b48d71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390660/normal_5f8e292a020b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5f8cc378492fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417827/normal_5f9578d924ab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_5f8e46dd9cdd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_5f974b46aa932.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/18c503cf-cd88-48ff-bc37-9030c9d7d058/vuwitaripu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6865/2697/files/ripabikeve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2612/8289/files/xovinegivebile.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/motoretimusewimulodi.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/apertura_democratica_en_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/tanatologia_libros_recomendados.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_off0000690b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x690B 4992 bytes
SHA-256: 79eec12672f6f3e6375f74e76fb8a0cf23342ef80295598a8051de957a9082e1
font_01_sfnt_off000079ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79EF 10020 bytes
SHA-256: 32da4941af8dabfb9132c9dc4cd4c1208b49dc9ca3dd84dcd07a0a12a5ed7c6f
font_02_sfnt_off00009c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C31 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

Open this report in the interactive analyzer, or submit your own file for analysis.