Malicious PDF — malware analysis report

Static analysis result for SHA-256 a156a88d3eddd911…

MALICIOUS

PDF

41.9 KB Created: 2020-11-01 11:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 614bd0b7ea2264bf379ed9d67bc2a066 SHA-1: d8577a29f21fe3a1e859af9376cc6fabf11af74c SHA-256: a156a88d3eddd911cf323c16b1071aa54242a9153b9d7466bcef2d7309ae9ce1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=fastest+leveling+guide+110-120+wow In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f8da9b31dac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f9c69d1dcb18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_5f8fb4251303b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419626/normal_5f9b2051ed386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f90d18c1a54f.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/gebigikixijori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f8d438e22556.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/mibiwivanetuj/deductive_and_inductive_argument_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9690/2294/files/ridurre_dimensioni_acrobat_x_pro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0464/0420/files/ludepimodumavoxitakuzi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/1421/7638/files/budidaya_rumput_gajah.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9075/6252/files/soda_and_mentos_experiment_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4784/3497/files/47655629485.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/seekg_and_seekp_in_c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9182/7105/files/forgotten_realms_campaign_guide_5e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6104/1559/files/54649612097.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_off00006331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6331 5360 bytes
SHA-256: f37a5d8ffac2268193de2a1844c4a0fc5d4181cf444adf259cbe8d7ec27f55b4
font_01_sfnt_off000075a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A0 10980 bytes
SHA-256: ab5732bb278aaef2ee7800b35484e58da1fedc1ba7cd015afedc60de96bc5f60