Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a408fcdab05244b…

MALICIOUS

PDF

37.8 KB Created: 2020-10-30 01:59:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 32fff9875ecda6aa155e9dfa7969975f SHA-1: e05557de2b02324040db8dc30c29211577c4fc60 SHA-256: 2a408fcdab05244bed1d1b3f9bfa4f6fea88476444b0e7284a24d44ec5021cc6
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, with one identified as pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the presence of malicious redirector links and the link farm pattern strongly suggest a malicious intent to lead users to harmful sites.

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://ggtraff.ru/123?keyword=523+area+code In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_5f9b490321309.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/tewazol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_5f8e0b7048cb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5f8f97cad28cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f8762a33961c.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/filosom-lusiwikafese-jerupuxorukoti-novubolifunuw.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/932168.pdfIn PDF document text
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/xoxiwoxuzav.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/65eb3752.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/memul/xowogaverikuraluzipek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea3ba5e-122e-4af0-81e1-b756fac3db8b/letirenawetudegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8103ad1a-6b57-439f-bae3-232019ff70bd/dugupavexuwozetuwuladuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e7cf553-3b78-4d4b-bc93-575c4465a660/11523410703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97bc6b64-d037-464e-a754-4d2e07a72e70/vojufelawipekag.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/28_creencias_delos_adventistas_del_septimo_dia.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/89112592979.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/fokizonogatavikir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd3526c-8f63-43a5-a74e-cc4876908aeb/gunturbadi_income_tax_software.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_off00005703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5703 5048 bytes
SHA-256: 20dcabe9acb269c700b60ed5d2e454a18b45cf16fd51a4ce898612ad91eee73b
font_01_sfnt_off0000683b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x683B 9960 bytes
SHA-256: f1c350db4073946ec5a56d77ac92eda318769f7dcf83ef30875c425a5cdb560c

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