Malicious PDF — malware analysis report

Static analysis result for SHA-256 30128d7dd7a9d476…

MALICIOUS

PDF

42.4 KB Created: 2020-10-30 16:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b2ab63e9772fcefce19b0d1a0171d336 SHA-1: 350f997bc63b67e35d4bdcc2d9a950422d4176ba SHA-256: 30128d7dd7a9d47654e46c6d7314b230ccf83b43f42d65d72b3577946c7bbaa5
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting services and appear to be part of a link farm. One URL, 'https://gettraff.ru/123?keyword=medea+euripides+pdf+resumen', is flagged as malicious. This suggests the document is designed to manipulate search engine results or redirect users to potentially harmful content.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?keyword=medea+euripides+pdf+resumen In PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/1774698.pdfIn PDF document text
    • https://turikiripejuz.weebly.com/uploads/1/3/4/5/134501804/vifigekelumi_paseregeboxev_naxuxosupifi_guwamonuxet.pdfIn PDF document text
    • https://dabagurujor.weebly.com/uploads/1/3/4/3/134350609/5332292.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/roxuwadefobok-palireva-tuwuxovunini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_5f968d832093c.pdfIn PDF document text
    • https://beperiguvo.weebly.com/uploads/1/3/4/3/134320750/zopawup.pdfIn PDF document text
    • https://jugizefabugej.weebly.com/uploads/1/3/4/3/134377355/bakuwur.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/dafec9eb-3887-4594-8be0-83bedcac0ad0/48936851020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/8973/9935/files/senlin_ascends_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3331/6514/files/jukezujikigudo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5246/4804/files/just_cool_awdis_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16bc9c89-0d79-4257-a7f4-77d2cea3cf3d/butozanevegemi.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_off000069d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69D9 5160 bytes
SHA-256: 66af1a751a37e91b56a28fe8675d6f3851a07f34171807a48b973154664d79a9
font_01_sfnt_off00007b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B57 9984 bytes
SHA-256: b9dcd66118e84db97e69380862dbc24cd2457dee9bfbfe81c3cf49a9d3687a4c

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