Malicious PDF — malware analysis report

Static analysis result for SHA-256 688470e029aed105…

MALICIOUS

PDF

41.5 KB Created: 2020-10-17 18:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1b3edc8b06a26acb99acb20f24cdca33 SHA-1: bd9367d44c6ec3510a00c998dd0851c77651fdd5 SHA-256: 688470e029aed1054abf4914345eb5904d2b768f8e3651b07d783f115756b2d4
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and appear to be part of an SEO link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches one of the identified malicious links, suggesting an attempt to drive traffic to potentially harmful sites.

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=espidifen+600+mg+sobres+prix In PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/roruj-fegedevovelere-zexomojikazi-rewubujelem.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5648329.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/9325577.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/8e42bfb8d1b0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5f8835cc9fd33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_5f8a3eeed20aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f8af4a842f26.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/zisedobaronux.pdfIn PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/9e84eb0bd5.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/kuvozok.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/1/0479/5118/4028/files/official_guide_to_the_toefl_test_sixth_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3180b044-44cf-4e14-bee8-f8b58eb68dd7/bazeguduponizovesonenut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c141f307-aea3-48df-a1c8-444d50b62eb4/40175571823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8780252-6fe8-4a0c-81ea-98d84db0c8b8/rojoful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/564e25b6-8930-4666-83eb-4e4b377313e9/pesenibuvobidov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90071c8f-2dab-4efa-83cd-2c24bd5ccd8f/kopufilarokamopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafc44c4-98df-4c21-98f9-96d3850b48ff/9458041149.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_off00006537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6537 5580 bytes
SHA-256: e97662f193e37637697563849d85ca9b261a6f655870af2eefe68358ca0d46d3
font_01_sfnt_off0000781d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x781D 9828 bytes
SHA-256: 413e19a8f64d89b610f6e6c7cd3e6f7b8f659aea4df32bcbb77b5dd2f4315d9f

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