Malicious PDF — malware analysis report

Static analysis result for SHA-256 501c6f7a59a81be5…

MALICIOUS

PDF

48.3 KB Created: 2020-09-30 05:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bc9a46d8942f76f2d30125d626baf1df SHA-1: 3f4ab2b004ac62109cf748f696a39e0d441c762b SHA-256: 501c6f7a59a81be5d577d4c62d64dfa35714be35a538e6fb7971a1966eaf55e7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious due to its function as a link farm designed to redirect users to malicious infrastructure. The document body, though partially corrupted, contains text suggesting it is a 'Catholic social teaching pdf book' and includes a URL that points to a known malicious redirector. The presence of numerous external links, many hosted on disposable domains, indicates a tactic to manipulate search engine results and distribute malicious content.

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://ggtraff.ru/strik?keyword=catholic+social+teaching+pdf+book In PDF document text
    • https://site-1037088.mozfiles.com/files/1037088/xefanonugulonexibezefij.pdfIn PDF document text
    • https://site-1036950.mozfiles.com/files/1036950/nufovupidijujafanijan.pdfIn PDF document text
    • https://site-1036693.mozfiles.com/files/1036693/welikajinakabaxonozaw.pdfIn PDF document text
    • https://site-1037018.mozfiles.com/files/1037018/32226943654.pdfIn PDF document text
    • https://site-1036695.mozfiles.com/files/1036695/viloj.pdfIn PDF document text
    • https://site-1036698.mozfiles.com/files/1036698/bulatenenuxudarokajixori.pdfIn PDF document text
    • https://site-1036632.mozfiles.com/files/1036632/tutememesojagiguvum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1094/9273/files/great_weapon_master_5e_dndbeyond.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4635/3561/files/almond_breeze_unsweetened_nutrition_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55dfeba6-3103-4bf2-a377-056b17a4fb1d/nubomumofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/050b2e7f-694e-455c-9ee3-1818d4be9c0f/repifoxututenatebutix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c635761-ea29-41ed-be01-592dc4422d9f/xevevep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1f56894-b92b-4e95-a7d1-0ba83b8ae458/josada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c969667-2e74-4684-9151-892c535c8bb0/45891232134.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_off00007f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4F 5432 bytes
SHA-256: 1c5162b161946ed406740105553ebc1032b1652ff6cd30980afd79fc96b312a9
font_01_sfnt_off000091c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91C2 10128 bytes
SHA-256: 331434bb4d48349f4455a07d20d1c79fd99cb2665f4592e9f203057165f48677

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