Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a27723e7595310c…

MALICIOUS

PDF

42.6 KB Created: 2020-10-25 20:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0c4b80a6f3a3ea90fe01e80ca56b1f17 SHA-1: 210dd2de449e0a6c3725c41cac92d953cd4f2dba SHA-256: 9a27723e7595310c033be28809e091442e815169908533ef3f8d94b355f281cd
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.ru/123?keyword=hotel+california+intro+guitar+tab+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f9156ad4eb68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418575/normal_5f9581d373d58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383798/normal_5f8fc4f0c44fd.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/9019550.pdfIn PDF document text
    • https://rimosuvifakub.weebly.com/uploads/1/3/4/3/134310068/4806429.pdfIn PDF document text
    • https://sutogibigasoju.weebly.com/uploads/1/3/1/0/131070189/e1ae4da9613d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_5f91fa6993acf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_5f8c8c0ea2e42.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/a934f727-faab-4776-8cad-7a4de5743a87/xagabosexovuxiwukoziri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30fd0484-5513-4bf0-9671-3cc8d3d67d69/taxusimaxepeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30fa3b6b-cf1b-4061-b088-447dc12907f0/xixabivaliwefukolorojuzod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a1ac179-2354-4643-aa50-90d044f73cdf/4934227043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38318984-df33-44e3-82c4-13f8fff1320c/jixalalofuzus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452cd0e9-8da6-4ae8-b4e9-396ab5f4faff/16040900061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ec26a45-7ab5-41e4-a62b-ae6b6a1d279e/bedateku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee6eda8-b692-4d6f-97c2-edb97225ad19/lexumikuwoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45bc9b37-cccf-420d-a94d-9ad732c89f84/bamuresugizesimajowitoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac5552c-4b8c-4a61-afe2-85b52a00f591/luvupum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20998774-93ca-48a7-8716-604273a9fb1d/miluzud.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_off00006711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6711 5244 bytes
SHA-256: 4394112dccb38add538ae9aa6f1056246b539284d547451a3185716ac761ed04
font_01_sfnt_off000078e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78E5 10624 bytes
SHA-256: 1aaa991d61da2e49d58f825eccbedaebcc8e2da620b06fb23a77a0f733e4444a

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