Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d75d9a0d1778e4…

MALICIOUS

PDF

61.2 KB Created: 2020-10-09 01:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3160725f5ad4b7732777dc9b2ee09bf3 SHA-1: 3f4834200055454e8518aea4bc9cec156014beda SHA-256: f1d75d9a0d1778e4f33c444d84558e596ce84190ef6809d0a27f7400b7bc0a4b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external PDF files, a technique often used for SEO spam or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the embedded URLs and the PDF structure suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/strik?keyword=water+pollution+research+articles+pdf In PDF document text
    • http://files.telecomuff.com/uploads/1/3/2/6/132695323/e7a1a73a67.pdfIn PDF document text
    • http://files.coryhisle.com/uploads/1/3/2/6/132681758/burorilupune-lovos.pdfIn PDF document text
    • http://files.lasperlastv.org/uploads/1/3/0/8/130873810/8960659.pdfIn PDF document text
    • http://mevakez.andrerowejr.com/uploads/1/3/1/3/131398428/zugepo_kokegitevowedof_geligovanegabu.pdfIn PDF document text
    • http://vopepak.portsideartsmobile.org/uploads/1/3/2/7/132740564/7164326.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/715bdd54-1a9e-4b50-aa1c-48c5e9e284f2/puzal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68860072-179a-41bc-8134-1464b2304224/9890892103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1edc147d-d8ea-47a3-a32f-21dceb2b1f53/zanawakobajofizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c67256-803d-42b7-926c-0728f1503641/53025337190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373ed55f-9f71-466d-b274-a03e42214439/maxilewewokegijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0e22b3-0d08-4320-85b3-a2fdda42921f/5854129734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02978767-a271-436a-a528-7763771899c5/luvituzevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f94854d3-9cfc-4c32-9ca8-0a6818467ca2/76257379687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8de2ae06-b06b-4204-aa28-52a126ec1451/48008206772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c803d331-4299-4dcc-9c4f-45060460ac2b/95735166284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70047ddd-2616-4402-aacb-6ce78fb35de9/11982206755.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_off0000b201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB201 5256 bytes
SHA-256: 10275e9a397e0ab6ca17dc978efa200d20ff1a327f302e04f3c231ba5e21c6cd
font_01_sfnt_off0000c3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E9 10616 bytes
SHA-256: cbf6f21b24a590837ae579d791bd18763144d544498d19b38523a211bc69fdae

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