Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ffe2e6bfd860b7…

MALICIOUS

PDF

43.3 KB Created: 2020-11-01 07:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 59fba6f7f65c849ed3a4082118112d00 SHA-1: 2fd13f56e993e140c0970e124dec2e7013da9f79 SHA-256: f7ffe2e6bfd860b7a2cfa209994c8bc394a8b6d97cd021a84ebdae65a075f673
154 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, many of which point to a known malicious redirector. The document body, though heavily obfuscated, contains the primary malicious URL. This suggests a link farm or SEO poisoning attack designed to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=white+ramus+communicans+and+gray+ramus+communicans In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f915790e5c49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f87073bb4ecf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_5f88637931c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407747/normal_5f9ad9ff1a080.pdfIn PDF document text
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/04a0a722529b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5f932992a0051.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/cf4e5e12-8ccf-4bfe-97c3-aeb900d27662/ayakl_bela.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3540/1112/files/anatomy_and_physiology_of_skin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2019ae4-129d-4e0e-abd6-08ff37d234bb/bijatinadudaluxapajo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3382/8769/files/rajesh_kumar_sharma.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/lovowakarutujubag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9325/7109/files/conduct_certificate_format_tamilnadu.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_off00005d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D84 5320 bytes
SHA-256: a175937f4042290709afa518ff971f85e76b10740a2a8dbceee69a7d3b9635f8
font_01_sfnt_off00006f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F78 10144 bytes
SHA-256: 5f70fc04d8cba60454754112d055b3d406f968c9c73ff0961338143ae4fc1030
font_02_sfnt_off00009207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9207 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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