Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5b70cfcb96ba3f…

MALICIOUS

PDF

72.0 KB Created: 2020-10-18 19:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a15747e8fe181f35eefabae8054ae0d2 SHA-1: 86b459ec1fa7ea2ad38e418f7c7c84a9e325ac55 SHA-256: ad5b70cfcb96ba3fedcd558f426af8f7e5b9fb80fe03ea762f220d8de5192864
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are part of a link farm. This suggests an attempt to manipulate search engine results or lure users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/123?keyword=artimanhas+da+exclus%25C3%25A3o+pdf In PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kinufijozulof.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/3f438ec1fcceea.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/7971455.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/3521372.pdfIn PDF document text
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/loropufozader.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/94e5d2e7.pdfIn PDF document text
    • https://balejumefem.weebly.com/uploads/1/3/0/8/130814467/dabefusi_natozevi_fubowudezososa_vevopize.pdfIn PDF document text
    • https://mepetimis.weebly.com/uploads/1/3/1/4/131483418/depenevopesepubet.pdfIn PDF document text
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/tekufek.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/pusonux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_5f8b60ece9bf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5f89bdf81cf68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5f882cf8bda3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f8a90b46927b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f880b0c12c8d.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/2d876f4c-202c-4639-8ae8-c9297630e5dd/vapemivebogagizij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d92f896b-cf63-4524-ae88-18c035d001e3/zitemapagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88f3048-3539-4fe0-be16-b40fa17e47a9/didejusoxezefebalunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/857b6b60-c215-4457-89c5-b839974edeb4/98592149198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53c7dc9-773e-4cae-8baf-e087794847fb/68920081726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08db98e5-ec33-417f-a500-721d62767b18/gitugafisoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6002c154-7226-44c5-96d8-af6acd609a03/22260383963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a29a64c-a5f4-416b-8f57-2b956ab91076/waletekiwezibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a018d4fe-2348-41b6-9c26-7d8c62ae0feb/58440338291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0331d4a7-ccbb-4e3f-b314-c097b0894ea9/gesakazawuvovakifozeda.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_off0000c9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 5652 bytes
SHA-256: 04de0512f1977a87ddf2ffc18850eddd78e385692ec240a8c2453ca8b7e083cd
font_01_sfnt_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 12568 bytes
SHA-256: 1311e6c02c44c7ecd465c3da14e2ff588b6f0b1af2de33f2f235843a1f8eb4df
font_02_sfnt_off0001023c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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