Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f631da867b285f2…

MALICIOUS

PDF

41.4 KB Created: 2020-09-30 09:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 597b59c751bd08e4d143ed1072f3ec7d SHA-1: e58206e73d8c3d63f03b0d7bd88cc2b3adfb2109 SHA-256: 2f631da867b285f2845018fbabf8e11b0fbc1d8ab756883dc4cb9fb6edb2af77
184 Risk Score

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://cctraff.ru/strik?keyword=las+reformas+borbonicas+pdf In PDF document text
    • http://files.qmoments.net/uploads/1/3/1/4/131409024/6142716.pdfIn PDF document text
    • http://farajagid.azerperlite.com/uploads/1/3/1/4/131452958/binag-fadanuxuzax-wonulozabiw-vuwopogakir.pdfIn PDF document text
    • http://xibusoxo.nymica.com/uploads/1/3/1/3/131380349/7437461.pdfIn PDF document text
    • https://site-1037253.mozfiles.com/files/1037253/8385581937.pdfIn PDF document text
    • https://site-1036725.mozfiles.com/files/1036725/tijubala.pdfIn PDF document text
    • https://site-1037120.mozfiles.com/files/1037120/15481413749.pdfIn PDF document text
    • https://site-1037145.mozfiles.com/files/1037145/loluxolunik.pdfIn PDF document text
    • https://site-1036880.mozfiles.com/files/1036880/33168557466.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/e2ca4e8f-75d0-4cc7-9bfa-9f98154c8135/duwaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab9237a-7419-4fa0-bd5d-b4f1d4c23959/kurijideselevogovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f7c4595-bbbf-414c-80f7-dc91040b5c0c/nepavigapitagat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c1639f-22ae-4ea6-a60e-429dcd5eaa7a/54206293337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec268abe-c53a-4aef-9dc3-ee36df15536f/84911974291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c4d504-d5c2-44fd-9605-0a39d0b3077b/72067594018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ebb6664-e308-4322-bc2d-a0678441961d/xejakuwolalivofoxebefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4bf70a-a925-4a09-a0be-9212d25d34a4/26928906761.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_off00006250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6250 5348 bytes
SHA-256: e8c461bf1aa27aed646159243420443ce4c623ad8b6138a3adf34cbcb68846eb
font_01_sfnt_off00007462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7462 11184 bytes
SHA-256: d0e946880c48040c8deedaf4267d189be4345ab33faf8093707ec245ebc1d3b0

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