Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36aeee8ab659300…

MALICIOUS

PDF

51.5 KB Created: 2020-10-11 07:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 42c23153cc8818fde3bd25e9a19c72d9 SHA-1: ede907243c0a3dd01ac8b57afe9c7cd9ae262a05 SHA-256: c36aeee8ab65930096fe22cd6dcc2415d5897af5c1f0c7de4d91d05f63c4192a
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=ielts+speaking+sample+answers+pdf In PDF document text
    • https://site-1037011.mozfiles.com/files/1037011/gifexixif.pdfIn PDF document text
    • https://site-1040164.mozfiles.com/files/1040164/73897430563.pdfIn PDF document text
    • https://site-1036630.mozfiles.com/files/1036630/sasiramamujekuzoxej.pdfIn PDF document text
    • https://site-1039991.mozfiles.com/files/1039991/gofolatoboj.pdfIn PDF document text
    • https://site-1039639.mozfiles.com/files/1039639/wapidam.pdfIn PDF document text
    • http://files.staugustinesmorrow.org/uploads/1/3/2/6/132681516/4062660.pdfIn PDF document text
    • http://files.lollyvibe.com/uploads/1/3/2/7/132740194/wopafatimoxeb.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/210063b7-98f1-449c-95e4-93f27ddb45c5/pijurebebalimuxatibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb3a319-a5cf-4ead-a728-563a49c781b7/46546325577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf7cbcca-5f54-4ce1-bb0e-43b113ddb38f/71288089995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bcbcef6-2093-44fb-b11c-2db8294d132e/titetatamagumobonedopal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e5895b2-4cfd-4cec-bec4-a12a523f6bfa/xatimip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ae1b3a-7437-43fd-a3c4-a1105b0b807c/fowagutidud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf47bae-f4c8-4eb3-aad3-980d6414a411/26659399108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1682ce3e-f21a-46df-9b40-74562089558f/zivubolawojated.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_off00008aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AED 5452 bytes
SHA-256: 91f06e74d38c7f3eb491218722acda49abbdb99ecca8d75883ffce8e2e43c46b
font_01_sfnt_off00009d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D77 10624 bytes
SHA-256: 9953319e5c25b227997bf94f35add2c546610a36ee77a397fb4e672472ace4c2