Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f26a50fd1c7e79c…

MALICIOUS

PDF

43.4 KB Created: 2020-10-29 11:23:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8610a44b099763998c896557ea59f62d SHA-1: 7ecc37d0dff4c44c382b31f5cc25988697f27d6a SHA-256: 7f26a50fd1c7e79cbd629d17b35b26859d312e890dc4fee17721bbaabd3f1121
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, with heuristics indicating it functions as a link farm on disposable hosting. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text and a URL that appears to be part of the link farm.

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://ttraff.ru/pify?keyword=stella+di+campalto+rosso+di+montalcino+2014 In PDF document text
    • https://tanezogifa.weebly.com/uploads/1/3/4/3/134321065/c8fdb1595.pdfIn PDF document text
    • https://tivurenufetoza.weebly.com/uploads/1/3/4/2/134235987/fokisilugob.pdfIn PDF document text
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/c131df43b418a.pdfIn PDF document text
    • https://jefogozadiz.weebly.com/uploads/1/3/4/0/134040800/vofun.pdfIn PDF document text
    • https://juwimifabofif.weebly.com/uploads/1/3/4/3/134369341/rafelibokitapab-buraleb.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/paxajixemudozedomu.pdfIn PDF document text
    • https://guvapokasek.weebly.com/uploads/1/3/4/4/134437462/b1a25df45d3.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/e90d6eaf70.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/b4f8025.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/caa64.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/ritijovoteg-bunevobegomav.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/fd699370-cc60-4978-aa77-0fd8f5b2fab5/ostep_code_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0033/0903/files/mathematics_formula_class_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee01bdc-159f-48a4-8374-02bef21e826a/veloxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7527/2855/files/shiva_puranam_book_in_telugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9205/7506/files/bissell_crosswave_cordless_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/5616/9628/files/automatic_vs_manual_winding_watches.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/fofodo.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/crock_pot_manual_slow_cooker.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7764/1409/files/buddhism_worksheet_rel_133_answers.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_off00006551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6551 5736 bytes
SHA-256: 97652d1f52ea9cf8782b8894ed49cd2046d4e8c175e9b05a653b15992f9f944c
font_01_sfnt_off000078c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78C8 11564 bytes
SHA-256: 839f0d175c058c732995746df91a1e09761a38940645622548c92efdbe824fb7