Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfc3d633d29c779…

MALICIOUS

PDF

36.8 KB Created: 2020-11-05 02:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 49b459260ad510716aa28e929d8163ba SHA-1: d17f7272d6c6c94b499350b86400e847ee1b07dd SHA-256: 8dfc3d633d29c7794e58b638a3ff30c38cd0d3681b27221aa1cff9595c507cb5
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern appears to be SEO spam or a link farm designed to direct users to malicious 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://gettraff.ru/strik?keyword=arme+anna+full+pdf In PDF document text
    • https://bogemokized.weebly.com/uploads/1/3/4/3/134386998/zenobakiwa.pdfIn PDF document text
    • https://duvupobilalef.weebly.com/uploads/1/3/4/6/134630448/38b18d.pdfIn PDF document text
    • https://mepuzorow.weebly.com/uploads/1/3/4/5/134500467/1911a70f9b1f.pdfIn PDF document text
    • https://malebikixolu.weebly.com/uploads/1/3/4/3/134358595/1430061.pdfIn PDF document text
    • https://sigakoge.weebly.com/uploads/1/3/4/4/134437147/e4e36836471c7.pdfIn PDF document text
    • https://terowibew.weebly.com/uploads/1/3/4/3/134370771/3573504.pdfIn PDF document text
    • https://rariborujur.weebly.com/uploads/1/3/4/4/134443596/tikivegos.pdfIn PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/xegusewi.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/votor.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/pumebafapobonazanibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/afa47794-003f-4395-a9a8-3110fc775cb0/4037895119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57bc940-291a-4746-bf0d-44e6ac6b2bd8/2834250982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26ab5d57-87f2-4409-9648-a4d9401238eb/88128543186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c69306-0eee-4d12-896e-5506940bd04c/vibafonorisuwuvulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/240d83b9-ea71-4c3c-93f6-646e102027bc/rowifananamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985e260e-aa44-428c-9bf6-08f952239fc7/76328870015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ffc7f2d-d251-415b-99ec-9e0bf2cfa142/vivipakojumijasekiberu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000474f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x474F 4640 bytes
SHA-256: 13185088058d758223f9771ec2070c829a242ef139033a1795dfe1f1ace33bc8
font_01_sfnt_off000056e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56E2 9808 bytes
SHA-256: 11cbef23272afd0e85127582ec3eff6821ee7bebb091e8432f498e480102c533
font_02_sfnt_off0000783b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x783B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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