Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ee3b924f613513…

MALICIOUS

PDF

74.3 KB Created: 2020-10-29 19:08:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d9db87482f4d21615654c373abd2101e SHA-1: 1e51cdce235d9bb0db9cb6cbe94e33a83dc0909d SHA-256: 91ee3b924f6135139c8f641ee71f91355ee5ba7046f3b18b48e853aae707d3b2
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to known malicious redirectors or disposable hosting. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to lead users to external, potentially harmful, content. The embedded URL 'https://ttraff.ru/pify?keyword=shan+yu+mulan+eye+disease' is a key indicator of this malicious redirection.

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://ttraff.ru/pify?keyword=shan+yu+mulan+eye+disease In PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/70b5e2514cc.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/jaroverewu_gugez.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/kagasiwobut.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/4340579.pdfIn PDF document text
    • https://jugoruzaja.weebly.com/uploads/1/3/1/4/131407370/dukob-fesineduxixoxax-dibutosexivudi-soxolov.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/908d89f.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/kakupiwuzupa-wipakigogak-zobofega.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://uploads.strikinglycdn.com/files/cccee026-db22-4f90-811c-0c9dfd4fa2b7/tugezewukotukizawuzekev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9051/9221/files/water_content_test_of_bitumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06fbc1c6-f4aa-412f-acd4-04e529de0e52/48831860551.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/o_burlador_de_sevilla.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4942/4322/files/lotagulikamepetejiwure.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9B 4868 bytes
SHA-256: ba2f5c716473aa61fd532a8f73fae1f41c90e7bc1686fe46d48cabe4cd64010d
font_01_sfnt_off0000cedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDF 12984 bytes
SHA-256: 1be3eaeaa869151df68d1f40a346b2af239fb9b6f5b810643ea5f929d9b078c1
font_02_sfnt_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 16092 bytes
SHA-256: 51916e08ba3314e41f6604021376b53d2a921b35e9ccda717e7b780f22163610
font_03_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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