Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91cd8c34055b861…

MALICIOUS

PDF

100.0 KB Created: 2020-09-30 13:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a0afd651c2afe2dbc3575cd18ffc7781 SHA-1: e7a1407f61cb3e6d85ef48f8992a81ec9e01aacd SHA-256: d91cd8c34055b861c7c302accf58fdd8cc98486bcf1290f7c7845a1bb85a0da6
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, forming a link farm, and one of these links redirects to a known malicious domain. The document body, though heavily obfuscated, contains a URL that points to a malicious redirector. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing.

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://gettraff.ru/strik?keyword=acuerdo+de+paz+resumen+pdf In PDF document text
    • https://site-1036987.mozfiles.com/files/1036987/xeseviriwe.pdfIn PDF document text
    • https://site-1036955.mozfiles.com/files/1036955/76981327608.pdfIn PDF document text
    • https://site-1036823.mozfiles.com/files/1036823/81479879522.pdfIn PDF document text
    • http://files.arulbalaneurosurgeon.com/uploads/1/3/1/3/131397974/kivazibu-putaf-raveka-newekaze.pdfIn PDF document text
    • http://files.adentaperu.com/uploads/1/3/0/7/130775370/ripeviragiz.pdfIn PDF document text
    • http://files.jfwarner.com/uploads/1/3/1/4/131483491/7111218.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0862/9659/files/femibagigifujilepofof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5698/0377/files/scarborough_me_public_works.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8888/5400/files/36105777416.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8702/6590/files/best_rogue_dps_spec.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8628/9832/files/lego_island_xtreme_stunts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0614/8255/files/antena_tv_apk.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_off00014599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14599 5308 bytes
SHA-256: dfdf654c2e6355a0b7d40234ebc1e0b8c2c0839feb793670996dc8c9fda526d5
font_01_sfnt_off0001579b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1579B 12792 bytes
SHA-256: 38ce0048e5f20fe66d23f8a62aa729821b50483b87f9f771da2b8afa0ebd3f6f

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