Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b96b36cd4856e0f…

MALICIOUS

PDF

67.5 KB Created: 2020-11-03 11:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 365e4f175f5dac8e8edccbe0d6994f65 SHA-1: 9a62ef8fddc980257bbc5c72624663cc4a2c015b SHA-256: 2b96b36cd4856e0f7b156c28758e43a2be8b890cbf15186797e77a92ebecda99
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a large number of embedded links, many pointing to external resources. One critical heuristic identified a link to known malicious redirector infrastructure (ggtraff.ru), suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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=sayumi+michishige+images In PDF document text
    • https://ludasajuwo.weebly.com/uploads/1/3/4/0/134096591/topabere_jexaruzowomati_fogasatewak_pijokujafarodu.pdfIn PDF document text
    • https://toxoxazagole.weebly.com/uploads/1/3/0/9/130969938/4730557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_5f9270bc58937.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/fuwototutap.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://s3.amazonaws.com/zetare/counterfeit_gods_download.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/fekabejukalepaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80041bbf-ee70-416a-b0e4-697d2aca8003/flip_the_script_book.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/alternative_building_materials_and_technologies_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/musinefejevawajafogetumu.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/81915683404.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000858a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x858A 8448 bytes
SHA-256: 07e67767452faa4f8a0a1b5502859c3386209be224c3289b6523eaf75a8a4e9d
font_01_sfnt_off0000a1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1AA 4876 bytes
SHA-256: 4729812bcada2889abb63b51268ef7e4428e27806b16b091eb30fffd885ee454
font_02_sfnt_off0000b23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23E 13552 bytes
SHA-256: a7d52f2fe36c6a956cda7551e0b9a2e11d29679fa3f76a932df5bf1b250e359c
font_03_sfnt_off0000dd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 16208 bytes
SHA-256: c77a2a438e2470f4a39d32d855f3c5af1c8f579a3c1bbdefbdb7fa79ab6b13e4
font_04_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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