Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad4dbacf5e68d70…

MALICIOUS

PDF

62.2 KB Created: 2020-10-01 04:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 21111434f90a99c2fa675dbe99ddc532 SHA-1: 7e50754c3b9c573dc7dcb2d625148196c2f5eeea SHA-256: 6ad4dbacf5e68d7020207a43017d182340b3f9a58832ebf19d663c9187df1cf3
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical redirector link to 'gettraff.ru', which is likely part of a link farm designed to drive traffic to malicious sites. The document body, though heavily obfuscated, contains the malicious URL and suggests a lure related to academic journals. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=qualitative+data+analysis+journal+pdf In PDF document text
    • http://kiropejut.portville-presbyterian.org/uploads/1/3/1/3/131383514/bazif.pdfIn PDF document text
    • http://files.konajoanna.com/uploads/1/3/0/7/130776043/pogipitivoxen_molozologob.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://cdn.shopify.com/s/files/1/0428/9835/8432/files/71895612735.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/9581/2005/files/advantages_and_disadvantages_of_social_networking.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/xuzajirutikuvuweziwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0970/3062/files/mikimuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5025/1941/files/13174150405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e38790-5a56-489f-af47-4a7a9db40e6a/27732069056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15d539c-1051-4c90-aaf6-9a007e1842b3/16187375067.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_off00009f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F5B 5216 bytes
SHA-256: ccc37175c35d9f67752563fb310628bed2e8caa1b075c50f79b9193db6db8a87
font_01_sfnt_off0000b131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB131 14204 bytes
SHA-256: 8ac1ad9df05ce7c446001a38c928de0e5265af88521e59abeeb1f3c00446fe70
font_02_sfnt_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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