Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d9bcd8f3cc970a…

MALICIOUS

PDF

34.8 KB Created: 2020-10-29 19:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cc53829013daf15713a98217ad3d3fb5 SHA-1: 559c7b09538db68d6771063b59726dc17d1b1c66 SHA-256: b3d9bcd8f3cc970a044e9b09b9efaa5c01d4f0367c7b88b698a2dd3f92def3ab
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches one of the extracted IOCs. The presence of multiple links on disposable hosting further suggests a malicious intent to lure users to potentially harmful sites.

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 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://gettraff.ru/aws?keyword=moroccan+pendant+light+nz In PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/jorumonat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380082/normal_5f9909d068d94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f8db26309a66.pdfIn PDF document text
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/6eb3ab.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/resavipibidote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_5f914697be270.pdfIn PDF document text
    • https://seforurusux.weebly.com/uploads/1/3/4/1/134131879/kinabot.pdfIn PDF document text
    • https://sadutixonigonu.weebly.com/uploads/1/3/1/4/131412491/rafat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb9fb190-d4bf-4102-a602-9eb282361739/natugojojagevetexuwena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a5c10c3-b1af-4d94-a21f-a8af072299e5/35797380363.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/doxujaxonubile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12501c9-509d-4433-b2bb-e4463f9a1871/niduxanuraz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9300/6771/files/puxaforol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4461/7371/files/44304507262.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/worksheet_kinetic_and_potential_energy_problems_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c8e4d5d-0531-4e64-b75a-5a52ef313e93/denolidig.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_off00004a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A83 5212 bytes
SHA-256: d00e3ae8dc73769302fa6d91fdba5840f4fa27c40eb37ace189f81d27e3b3d6b
font_01_sfnt_off00005c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C49 10024 bytes
SHA-256: 16128cbb0639805540563f0b5aa40f55bc6e95762fe20d89354ea71edf548093

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