Malicious PDF — malware analysis report

Static analysis result for SHA-256 475931e7a1771a0c…

MALICIOUS

PDF

41.7 KB Created: 2020-10-31 07:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 578f3dbfd65e2397e49412145b640423 SHA-1: d8470e8ea53088dd2b7d784fef620bc3a3e726fe SHA-256: 475931e7a1771a0cb1b4f1bb215fae9b20fcfe8572ba7bc9edd77e062719350d
154 Risk Score

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 S3 buckets and other benign-looking URLs, forming a link farm. One critical heuristic firing indicates that a link within the PDF points to known malicious redirector infrastructure at 'https://ggtraff.ru/aws?keyword=mr+etheridge+lcc'. This suggests the primary purpose of the PDF is to redirect users to malicious sites, likely as part of a phishing or scam campaign.

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/aws?keyword=mr+etheridge+lcc In PDF document text
    • https://rebivawofud.weebly.com/uploads/1/3/4/3/134375894/runefewuwodixoriju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_5f8e522b02243.pdfIn PDF document text
    • https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/8676388.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/rijaliwiguvex/42798826996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71cd20a0-d5a7-4b8f-b799-212f080f88be/45525822965.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/rejukomakebezujoruxa.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/zafano.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/project_scope_management_tools_and_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/74623471920.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/assessment_for_learning_b._ed.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/nadejunaradev.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/jefofavelagulosa.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/livro_arriscando_a_propria_pele.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/zowonadul.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/words_start_with_letter_r_tagalog.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_off000066cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66CB 4820 bytes
SHA-256: 2e2f89baed3cd4ecf945289a93004d195e0bae50543fd86b48d348a6aa118503
font_01_sfnt_off00007736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7736 10256 bytes
SHA-256: 4895cf9ff2b11ed6cf690491c9bdfcdc93bbc02e169203cb980a4017a5e6e58d

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