Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4d35430110c611…

MALICIOUS

PDF

48.0 KB Created: 2020-10-02 07:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 24e7c7942722e55216ccbeebde4b6b9c SHA-1: 578a92490ca90628ef74e42a5915bfc37454b57d SHA-256: bb4d35430110c611eaf9e13be177991bced49bda8d941f5952bace5a6c97cad3
184 Risk Score

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 domains and are likely part of a link farm designed to generate traffic or SEO benefits. One prominent URL, 'https://gettraff.ru/pify?keyword=xlr+to+usb+converter', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/pify?keyword=xlr+to+usb+converter In PDF document text
    • http://ragipos.chippewacohistory.org/uploads/1/3/1/6/131637016/b5a5d95cc66867b.pdfIn PDF document text
    • http://disud.maduradhvani.com/uploads/1/3/1/4/131483234/8493721.pdfIn PDF document text
    • http://files.sawdustsistersbirdhouses.com/uploads/1/3/1/3/131398385/rawuxazoveno.pdfIn PDF document text
    • http://files.nanoredbiotechnology.com/uploads/1/3/1/3/131398125/7847f971c163bd5.pdfIn PDF document text
    • http://files.natureswayhealthfoods.com/uploads/1/3/2/6/132695836/fepowolomezu-xodovedowule-fusudusewirexo-lejatifof.pdfIn PDF document text
    • http://juwuzo.jonathaneccleston.com/uploads/1/3/0/7/130740596/tedomajibusinub.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/1/0440/7869/4565/files/nursing_lecture_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8464/8100/files/paypal_hack_apk_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4008/0023/files/southglenn_denver_movie_theater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e7801e-4464-4edd-9719-e5361d6fdf08/lonigedanenifowadepobog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22657833-4070-400a-a0e6-58b7aa979992/kogenidigipuzinemifiwadak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42e581c-d221-4055-9aee-62c55dc4b98f/20453265049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c337d1-97f9-40bb-b52d-74a89574b42b/54735478140.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_off00007ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFA 4760 bytes
SHA-256: 16fd20a8166ab5966c6c7877e71c0c02230c3df297b0aa1cdae5dfdb3f8600d8
font_01_sfnt_off00009041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9041 10128 bytes
SHA-256: c67da23dab59bd547f3ebd09a032c0518b33cba7d85bad00384a8c24d96151b2

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