Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbb34b549801de2…

MALICIOUS

PDF

39.5 KB Created: 2020-10-28 03:24:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3fbaa57479fde88cfb9dee7d948d3544 SHA-1: c07b4160710c6690ecaba503afeb593d9423e934 SHA-256: 2dbb34b549801de22624aad68eb664de494852b63538816b180938765cf5731d
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or redirector services, indicating a link farm designed to manipulate search engine results or lead users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a known malicious redirector URL further supports this assessment. No scripts were extracted, but the primary function appears to be redirection.

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/wb?keyword=az%20900%20dumps%20pdf%20free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f9763f3de18f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376852/normal_5f8f70b71ff13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5f8b08954b60d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_5f8eb93dd1a5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_5f8a220fcf099.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/824ea4b.pdfIn PDF document text
    • https://zabugusu.weebly.com/uploads/1/3/4/3/134311035/a8e13485.pdfIn PDF document text
    • https://pativezakuzorad.weebly.com/uploads/1/3/4/2/134266084/3acb8.pdfIn PDF document text
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/zokavoruneposu.pdfIn PDF document text
    • https://woruvewuz.weebly.com/uploads/1/3/4/4/134400058/1881308.pdfIn PDF document text
    • https://kawigijutugin.weebly.com/uploads/1/3/4/3/134351661/27f3d1.pdfIn PDF document text
    • https://gumiworawogulaf.weebly.com/uploads/1/3/4/3/134356348/jodipej_dugewufotitojok.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/3379189.pdfIn PDF document text
    • https://lebidupevi.weebly.com/uploads/1/3/4/3/134319251/82690ffa2e7e.pdfIn PDF document text
    • https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/xeduwifo.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/e50a3a29-639a-4d32-ba4c-79a3438d3754/47188481785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c1b51f-847d-4f6f-bc0a-668b60c67816/el_destino_de_diez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4688490-04ff-4016-924f-3d5736030ab8/78093969972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ffdafc3-7441-4ac9-99a4-4702bc98e5f8/72008789818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/028e7730-9406-458d-a318-83bfc5d2eec5/majoras_mask_3ds_guide_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/xesokumomiro.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/biceps_tendonitis_rehab.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_off00005b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4D 5280 bytes
SHA-256: a5de244d16a8e9c1589a136a8e47bef35f49c0d97da860822c51586f237f7cb1
font_01_sfnt_off00006d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D31 10596 bytes
SHA-256: 08793d649e9afb064d3c6884f95753debf0d4069b36f0fc5b5325fb3736bde01