Malicious PDF — malware analysis report

Static analysis result for SHA-256 870a2363e756f03e…

MALICIOUS

PDF

40.3 KB Created: 2020-10-27 08:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dc64ea8d31b7986d9e7a313be353ba23 SHA-1: 25f764bcf3af5e7dc0a38604231f60395d5f7905 SHA-256: 870a2363e756f03e8b54f3766df12f557df7d98e26c64bd7ef0efc24f1a27d9c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to disposable domains and a known malicious redirector. This behavior is indicative of SEO poisoning or a phishing campaign designed to lure users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.link/123?keyword=how+old+is+the+drinking+age+in+aruba In PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/3842679.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/489924.pdfIn PDF document text
    • https://sasakafu.weebly.com/uploads/1/3/4/3/134371045/derefol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384650/normal_5f8c58c8d0447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374710/normal_5f91561946b9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f881da004148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5f8bd7ff19ed8.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/verebatupoxeb.pdfIn PDF document text
    • https://vomalokigalexa.weebly.com/uploads/1/3/4/3/134329787/juwuzaluguzoso.pdfIn PDF document text
    • https://zodebosamu.weebly.com/uploads/1/3/4/4/134444592/2375350.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/suzidowi.pdfIn PDF document text
    • https://gobisenuginofaz.weebly.com/uploads/1/3/4/4/134490447/fuzoxifakifu.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/29128fb2-d7a9-4f66-8b7c-a44914de22f7/56613153696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac90159-5fc7-4973-bdee-94e6be032a30/77323600662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f9b130a-c91c-4cdc-a412-b9857bf8098e/73330026710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6935fc40-bc3f-40ea-95b0-dd7bf091cc3c/55070356399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d3b2988-da70-4392-8ffb-4adcbba5fba7/48287848983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb7f3c33-739b-435f-906a-c15492cfd1a8/58845171001.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_off00005f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F67 5344 bytes
SHA-256: 7d33d5f2ed3f512c76522dc1d9c6765596bccd6709a6cd6788df7447302bfb5b
font_01_sfnt_off00007198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7198 10288 bytes
SHA-256: 93be218db17d686e0a60546e7c73538080ab824af8aeddb5b7cf190fc8e224ea

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