Malicious PDF — malware analysis report

Static analysis result for SHA-256 905ee0c8e8388f83…

MALICIOUS

PDF

69.7 KB Created: 2020-10-31 03:23:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: aad383550af85be564e192eba465b6d7 SHA-1: d45115c564144da2695e8d65f75ab09a0cbc1592 SHA-256: 905ee0c8e8388f83003b5fabf26657bbefcf7cf785307814c4a6f8601614ffe9
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. It uses an urgency-based lure. 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=forge+world+8th+edition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382782/normal_5f98671d64ad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5f9b3bb7cb823.pdfIn PDF document text
    • https://mubojage.weebly.com/uploads/1/3/4/3/134377346/loziwojivobuvadijoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5f93e40cdcf3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403674/normal_5f961b0d7fad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418991/normal_5f9cb96ee868d.pdfIn PDF document text
    • https://sadoxeliwuduw.weebly.com/uploads/1/3/4/0/134040540/gijavakigojiriz-lakutunugid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6748/8411/files/third_conditional_grammar_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c368196-7d57-4d86-ad76-d7eeaedef859/28896781605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00905373-b99d-45ce-a1e4-b4d4af5d30d4/78587355759.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/kojaboxiwigexajatowedefe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9032/2630/files/most_downloaded_online_games_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24cafe7d-4aad-4d28-97eb-4f2342554602/kipijelosaluz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e3a36f-78b5-49bb-b6c0-6c56deb6936a/baixar_livro_fundamentos_de_economia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4ab310-1132-423a-9055-31705849d181/vokape.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_off0000c99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99F 4940 bytes
SHA-256: 7bc33d7386ca46a74f00da97f786fe213f48df06b5c73276f056a177df56aaa6
font_01_sfnt_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 11248 bytes
SHA-256: 73e493d69b76be18a5fbc97d72262afadbb02b3e0313369dc6394299f223d3ff

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