Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50718914e3d5539…

MALICIOUS

PDF

50.1 KB Created: 2020-11-04 00:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b9ade31e07a862939959176a6d2ee1ea SHA-1: 9c806216b0039ab98c06e87a1115e398b4a1449c SHA-256: d50718914e3d553944af89349080dc2a654c6004f0d6fdc31e2277f0d2b5151b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ttraff.club/123?keyword=wright+junior+senior+high+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388158/normal_5fa0582f437fd.pdfIn PDF document text
    • https://zuzuxaze.weebly.com/uploads/1/3/4/0/134040629/guwaxoleja-levedewu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wonoti/cause_and_effect_paragraph_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08cb3865-c4bd-4577-b8fa-74e2c17ad281/dezenulugogafuxofuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56fcb6da-79ef-49c6-9d29-351fd1bd0355/39040855053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3701995c-a00e-41bc-bf69-6333e200744a/29180340263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a85b1112-1e08-49da-9228-f74a5d66f820/moxuvotujabubegemafutob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67945046-cc44-4910-840a-0491524153e6/65578378480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7aa555c-8510-4cba-a840-4ab0e1680cdf/lakowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5fc75a8-fd64-487f-b571-a636b3f7774d/pibibibizepokali.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/46907739233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28221a14-4b5c-4d73-a51d-1c8b43e114f5/7112249697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b00991c-180e-497a-a0f9-6519e623dc7d/tojulerituxomavufuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d85a6e0-b327-47df-81c3-e347354ebf71/pilgrim_cove_camp_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d924e08-feae-48d6-83a9-b4202afabe4d/6659019647.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000787c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x787C 4824 bytes
SHA-256: 8813fb4c9147ae493ed863127b094cfcbda47f14246a23b530b2f78cf79ed6e4
font_01_sfnt_off000088f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88F5 10848 bytes
SHA-256: 7b757dff8abacfb7c72a908215ebde6c6116f8e4c6aa9d258dcace602dac0f56
font_02_sfnt_off0000ad7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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