Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fce7a778172d3aa…

MALICIOUS

PDF

46.6 KB Created: 2020-11-01 15:48:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8541d274022e355a608d3df4a81120d4 SHA-1: 385a22faac00162ecf050ac263ec31729c1c216f SHA-256: 4fce7a778172d3aac501869fa670b743d1ffc94caf0f96f2a07957197edf72d4
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous embedded links, many of which point to redirector infrastructure known for malicious activity. The ML classifier strongly indicates maliciousness. The primary lure appears to be a link farm designed to redirect users to potentially harmful sites, as evidenced by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?keyword=480-376-8958+%253D+-8854 In PDF document text
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/8046487.pdfIn PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/zupabonagejabop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f969590903f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f9617de98253.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/280ffcbc-ed15-4ad4-9b46-6855f3365ab3/yanmar_1610d_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b78536f3-feaa-4f6a-bc5b-2b59a1545d30/93160481187.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2910/2244/files/st_croix_source_obituaries.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/5001/4115/files/legal_transcription_jobs_near_me.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4714/0519/files/1.3.3.a_thermodynamics_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7073/2456/files/jinabatuletinevijuvesa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5519/3503/files/lutaxiwotazukapadop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/2568/3362/files/schwinn_hitchhiker_trailer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5990/4157/files/linear_equations_and_inequalities_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/7605/9829/files/what_are_text_structures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/965db89b-d982-4bd8-a0bf-8807953a8515/74181328137.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_off00007678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7678 5248 bytes
SHA-256: 27ed9fd24fb72504be80c401479072d3fc9bb202512a0604c6467550553693fc
font_01_sfnt_off00008882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8882 10800 bytes
SHA-256: ae6b742f1ec6d15feffa751e9068e3432c7d20292b0678b6b31fd65ce130e135

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