Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c51d76cdbe32c58…

MALICIOUS

PDF

51.0 KB Created: 2020-11-01 11:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 237098575a5bc5f622696a86b6e08bc5 SHA-1: de98c49a14ba3b5cb460c7007db455900a6f6495 SHA-256: 0c51d76cdbe32c58c76f36b2fbc68337864e54e05b7359de771b573336ac4959
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ttraff.cc/123?keyword=warrior+cats+the+lost+stars+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f8e1e0e588e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5f8e326547c3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f91820799b01.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/5a201322-e5a4-47f9-8981-51cee070479e/begodipukivusafawozafeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df686cb-5e95-4eab-a536-80b61050bd68/wepew.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/vunopepabekajonuvol.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/nordicware_popcorn_popper_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/biostatistics_lecture_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/pdf_smaller_file_size_converter_online.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/tekken_6_for_android_apk_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/child_and_adolescent_development_articles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8840/5191/files/iec_62443_standard.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7299 5256 bytes
SHA-256: 00dfee27a9c6411eda3f1651801c3a50df5f20c9dae4553b80b84550f3fd1786
font_01_sfnt_off00008485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8485 11276 bytes
SHA-256: c35d2e9ffedc7c1c887827bae5a385be4e2136ddb42ad915264f71873c41fc44
font_02_sfnt_off0000aa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA5D 16060 bytes
SHA-256: 2cca29575edef7a9880cf400a7847cc5df22ba1ee7edc19c7b9bafe603f6c979

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