Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcb63119bc31dfc…

MALICIOUS

PDF

52.2 KB Created: 2020-11-04 13:12:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6f6cab0ee3ed6c62530e777db9e35776 SHA-1: 858ca3e5643a95f9305f4fc59e2b8cc0e4d4a59e SHA-256: fbcb63119bc31dfc6aff02b9fce73ba58c25efe6d639305eda6fc328f9fe3dab
192 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 of which point to disposable hosting and redirectors, indicating a link farm designed to distribute malicious content. One of the primary links, 'https://ttraff.link/123?keyword=watch+black+butler+free+online+english+dubbed', is flagged as malicious. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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
  • 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://ttraff.link/123?keyword=watch+black+butler+free+online+english+dubbed In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f875493bf72f.pdfIn PDF document text
    • https://pufotawimudob.weebly.com/uploads/1/3/4/3/134380049/nogogejavib_kunagi.pdfIn PDF document text
    • https://nusokusin.weebly.com/uploads/1/3/4/3/134350978/remisejawujaw-xenedu.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/gosibokuvefuj.pdfIn PDF document text
    • https://mefinijusigoti.weebly.com/uploads/1/3/4/4/134499215/338643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f87049d8cfad.pdfIn PDF document text
    • https://vedakevuvapi.weebly.com/uploads/1/3/4/0/134013486/8672d.pdfIn PDF document text
    • https://zuparimetusu.weebly.com/uploads/1/3/1/3/131378993/xonasu.pdfIn PDF document text
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/8617757.pdfIn PDF document text
    • https://fosogaji.weebly.com/uploads/1/3/1/4/131455903/a6cd8eb5b602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f89e6a487a93.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/1/0436/2836/3939/files/11848944708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7858/0907/files/38129868172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/922f5520-a251-4ae3-a820-4cf23aeae16a/63892238281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/251071f7-65bb-4ee1-b442-8b3d5cb79694/nozasivivezufa.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_off00008b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1D 5500 bytes
SHA-256: e95b5e434dcd5ea4a0ceb018b2547fd2087b9fc3e994bbfbf693c1eb7dfdc2bd
font_01_sfnt_off00009dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DD8 11220 bytes
SHA-256: 4951cfe8e8137f8e3ba43972075dca3724eb21dd3bc6eed7f62451d533418ed7

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