Malicious PDF — malware analysis report

Static analysis result for SHA-256 b239cd44cb3673c4…

MALICIOUS

PDF

60.4 KB Created: 2020-11-03 09:10:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: acdf78299ef90720a39464e72f7b7bdf SHA-1: 3257e222829118006cdf980647588900a5c3f218 SHA-256: b239cd44cb3673c405a5b873191eaeb6a7e0c8703acf77c468d096bcf2534fdc
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document functions as a link farm, containing numerous embedded URLs that redirect to potentially malicious sites, including a known malicious redirector. The document's content is minimal and appears to be generated to host these links, likely as part of a phishing or scam campaign. No scripts were extracted, but the presence of multiple malicious and disposable links indicates a high likelihood of user redirection to harmful content.

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://ttraff.cc/123?keyword=2019+calendar+events+and+holidays In PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/4619565.pdfIn PDF document text
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/rejagox-pipuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_5f9002ddbea22.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/64574e707272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f872a8d66184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f99948274b3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f93984a59271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414680/normal_5f9a814860cf5.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/kigesadisugot-pokunojije.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/2a74280d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387406/normal_5f9b1d5c2f031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5f8ba36c2a804.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/bfc56abe-3624-464c-8451-b99d3e6ce00a/kakupanemalepif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1848/5412/files/rust_oleum_aircraft_remover_on_wood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5e3b3f-bf2e-486a-879e-08942a70c249/6597905478.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_off0000ae98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE98 5576 bytes
SHA-256: 24ec6c8a28d35be41250d544882b3045dc51d289009ad92a8010cecc83adbcd5
font_01_sfnt_off0000c191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC191 10184 bytes
SHA-256: b99b2fe8a63773236c6bb6b51cc2a279b16c34af3a8402c66ffdb198a64057ff

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