Malicious PDF — malware analysis report

Static analysis result for SHA-256 31561d480a75104a…

MALICIOUS

PDF

49.2 KB Created: 2020-10-29 18:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0ad0db9f005643990a04d4459f94bfff SHA-1: 1c297a361680f069321714a172afaafb23788870 SHA-256: 31561d480a75104aa0c9483993c0eb20f3b9cda2c4c6b0f95eda2a5dd6ab64c8
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of a link farm and a malicious redirector strongly suggests an attempt to lead the user to a compromised or malicious site.

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/aws?keyword=parenting+confidence+questionnaire In PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/kegujod.pdfIn PDF document text
    • https://nosekuge.weebly.com/uploads/1/3/2/7/132740467/lodewe.pdfIn PDF document text
    • https://gutugifowofe.weebly.com/uploads/1/3/1/6/131606479/xopoweja.pdfIn PDF document text
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/2544884.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/cafaf473.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zedilegol/strength_of_materials_book_timoshenko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf7fd88f-18f7-4218-9552-061129bcc06b/rulemiwatetuniz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/fb_profile_liker_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2ea0b6-3988-4c56-9597-b1094190c141/forirufotafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0607a72-4c8b-4fa3-8794-edcf1196cb87/denevubefu.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/bessel_differential_equation_solution.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_off000082be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82BE 5284 bytes
SHA-256: f3e2b3afecc03c7a7f988189ff765be4d7c1b4f7588b0904841fa851947bbfc6
font_01_sfnt_off000094be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94BE 10396 bytes
SHA-256: 05b4d5c9bc7403577c15ebd3e4f204e72a2c2ca30bbb362f6033068b1a7ee42d

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