Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a75458254307288…

MALICIOUS

PDF

41.8 KB Created: 2020-10-25 22:28:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 782cb373bd7e2f690970d6febf470f1b SHA-1: 93a6ca0a97a454b4d83ff85f0405854d29672d1b SHA-256: 8a75458254307288931be65af93cea71bcdf89c4a0bd7f2e1388a150570c1d2d
162 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 a link farm hosted on weebly.com, and one critical link redirects to a known malicious domain (ttraff.com). The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting the document's purpose is to redirect the user to malicious infrastructure.

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.
  • 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.com/123?keyword=post+cardiac+cath+instructions In PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/ginadawin-kiwiwuvumuba-xigufisikox-denamisasosaza.pdfIn PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/modagosup-rovutebufedo-remoxu.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/nulijaxojujakawinaju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5f8ef5471e4f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f870c60a4348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f8935dceb062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f87095c99ec8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5f88b4ab25982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_5f8f467935b5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f8b48d40a90c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377120/normal_5f9061d92c48d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5f8f64c375dec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5f8dba39a48e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5f8e11c59c03f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5f8cf82a4213f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5f883a37686d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_5f91830f4961d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5f8cc02862a5e.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/1/0266/9356/6659/files/66544151244.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9406/3269/files/errorless_mathematics_jee_download.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_off00006589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6589 4996 bytes
SHA-256: e4f291760db7d80ed02e7ae90481debc6ad24cf5acd8d78464e4b1211c53cce7
font_01_sfnt_off0000766e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x766E 10496 bytes
SHA-256: ab1ee13ed7a0502d54492d561385229dd06614a496243086e0d8999ef9bb3545

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