Malicious PDF — malware analysis report

Static analysis result for SHA-256 455cd09cbdc5d9c6…

MALICIOUS

PDF

142.8 KB Created: 2020-10-25 23:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a5029e6ea4907211c108cb0200438100 SHA-1: 9f6a2d8347071a49f7252ba79434b97f67e0562f SHA-256: 455cd09cbdc5d9c64200c6fc0a5c4fc69719a0d777321c5edb32e9f89c07b50a
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 link to a known malicious redirector, disguised with search-engine-optimized keywords. It also hosts a large number of external PDF links, many of which are benign, suggesting a link farm or SEO manipulation tactic. The embedded URL points to a malicious redirector designed to lure users into clicking on it.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gettraff.ru/aws?keyword=charles+darwin+book+origin+of+species+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_5f8be7d0be246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_5f8fd29c13899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f8713be96429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f8d4d75e7320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5f91c72066312.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/sugaguxagu/studietrust_bursary_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/ruxatapuxesizisa.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/valagolugodikagosa.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/past_simple_present_perfect_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/16596030660.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/comment_convertir_une_page_html_en.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/segmentation_marketing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/0259/7023/files/visions_and_dreams_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7080/8765/files/cortadora_de_cesped_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4158/6332/files/unesco_global_geopark_operational_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1956/9818/files/zabugalo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8792/3862/files/vugapir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8648/8767/files/treatment_of_gestational_diabetes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5800/3096/files/wobakavenepipimomego.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0489/2973/4840/files/more_factoring_trinomials_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5328/4008/files/apk_editor_pro_full_cracked.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_off0001ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC6D 5620 bytes
SHA-256: 2840153575bc7cc8425eead2f319d7da362a2fb1f30f8dc8b3092be168f06004
font_01_sfnt_off0001ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF8F 13420 bytes
SHA-256: 7c567cd0de1f677d04651b9511d4416e667f343af718da07054ebe28b9c130b3

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