Malicious PDF — malware analysis report

Static analysis result for SHA-256 935d90a5e03352a0…

MALICIOUS

PDF

52.3 KB Created: 2020-10-29 23:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c7d8478af05d420f2a0dd818139071fe SHA-1: 99587fb0403e127d6f4414cdabe739e26c9fdd87 SHA-256: 935d90a5e03352a00f8ef89d4a2a753b0900ed575341d0e2548ff95441040ffd
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 external resources, suggesting a link farm or redirection attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious infrastructure, disguised as an answer key for an art project. No scripts were extracted, but the presence of numerous links and the malicious redirector heuristic strongly indicate a phishing or redirection attack.

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://cctraff.ru/aws?keyword=sequences+and+series+art+project+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_5f97451021863.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/0d52c4ff-c7af-4105-abce-ba071387fde3/assessment_in_counseling_hays.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7b4fb4-b52c-4125-b1c5-8ce94b1b1fc6/18813390603.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/33392456848.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/my_soul_your_beats_japanese_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cab891ae-4698-4551-8fbb-8cf00ac6f1c6/82477141327.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0508/0776/7237/files/application_of_nonlinear_differential_equation_in_daily_life.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/bejora.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/gupilupinudowetimelag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3176741-aa4d-4400-878e-650668a8d999/46771140084.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/7842026735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3995c9a6-9492-4630-b596-29f470afd441/the_division_survival_guide_19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e143039a-29b5-4cce-9e39-5f29523c4a84/pefewogineredul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173601c2-329c-4853-b628-b20778b72790/mibivopeduwodugowewig.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_off00008b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B47 5596 bytes
SHA-256: c2c694ee71ec8ace1a9cdc1b16329ac43633047102fbb93743933f128044540d
font_01_sfnt_off00009e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E81 11096 bytes
SHA-256: 11706accc3d14d612a42388735124461d1da8bff8d8b5aac7a43c0e57d01b979

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