Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d941a56e77cb23f…

MALICIOUS

PDF

61.5 KB Created: 2020-11-20 02:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ad1cda63dac82436da05835273783f7b SHA-1: 173f23b7cabb50e6544fe325af13718a24d80084 SHA-256: 9d941a56e77cb23f543887ef5b12ff3496f1c2bce0fd21352f96b11538b5f97d
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, many pointing to disposable hosting services. The primary heuristic indicates a PDF link farm, suggesting the document's purpose is to redirect users to a network of sites, likely for SEO spam or to host malicious content. No scripts were extracted, but the presence of numerous external links and the PDF structure strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?utm_term=turbo+rally+ranger PDF link annotation
    • https://bexitapanirid.weebly.com/uploads/1/3/0/9/130969950/xetoxazoxo_vujogetid_witot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5faba5144409e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385417/normal_5f996698e3dcb.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/919072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f874f9d289fc.pdfIn PDF document text
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/5822697.pdfIn PDF document text
    • https://sapezirotup.weebly.com/uploads/1/3/4/5/134576964/6c1244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_5fb5e27f68107.pdfIn PDF document text
    • https://turamuko.weebly.com/uploads/1/3/4/4/134458704/2a17d28fb3.pdfIn PDF document text
    • https://zosubidam.weebly.com/uploads/1/3/4/3/134316114/5715223.pdfIn PDF document text
    • https://soferivajateru.weebly.com/uploads/1/3/4/6/134650686/9557c02c00a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f9a142be1e68.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/8709547.pdfIn PDF document text
    • https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/lozokajifademu-dudonuvikotute-buranebibat.pdfIn PDF document text
    • https://nimimemuxigu.weebly.com/uploads/1/3/4/4/134488465/kipinegatibujop_bazafuw_zofig.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/fonibinaraj/enzymes_worksheet_answer_key_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/black_sabbath_master_of_reality_font.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_off0000b5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EB 4868 bytes
SHA-256: dc3638b8bc600937a97eb9c91300e75d567bbd6d1766794e1491858745a78f33
font_01_sfnt_off0000c697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC697 10172 bytes
SHA-256: 4844e604b5ce8f26543c0a68190c808d3c5d10309ae633762c23b9e4f381a397

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