Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcc3c65ccdc24df…

MALICIOUS

PDF

48.9 KB Created: 2020-11-08 08:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 156f31662d7c70ea57713ca5c5d11d65 SHA-1: 9da093c5e3bdec0e52ec9c9d76e17462f0390658 SHA-256: 5fcc3c65ccdc24df409cbe76d8736c9407b2fe8ffbb6f242acbc8c78fb4d1b3f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?keyword=boy+scouts+family+life+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_5fa371025165c.pdfIn PDF document text
    • https://wovuxitijijigot.weebly.com/uploads/1/3/4/5/134524902/xefozosugodad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rezekine.files.wordpress.com/2020/11/tatojesanawav.pdfIn PDF document text
    • https://s3.amazonaws.com/jaburirarov/te_extrano_mucho_mi_amor_llamame_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/lil_menace_the_world_is_mine.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/lovisonupebew.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/biosurfactants_production_properties_applications.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/lesogaboreragegorov.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/lethal_white.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/suridemagunilak.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_off00007961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7961 5428 bytes
SHA-256: 682f65f47977a7e4624c9de1732cd90db5229f678cccf36bf770e4732a1d7851
font_01_sfnt_off00008bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC7 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00009454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9454 9960 bytes
SHA-256: a87f4cc3216054bf6aa7f8686e84fe5caeed382375f14ad477b89a5c5ae68e56

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