Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39b7011ddcbe820…

MALICIOUS

PDF

42.7 KB Created: 2020-10-14 07:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fbd9fe7ccfbf088150b0d09529600dc4 SHA-1: f8a03bebd9190b1e8bcb53a6a2a1816e4b026785 SHA-256: e39b7011ddcbe82031da09ea9a0ba2a838c626b448ccf688a339b8a96ac1a4d2
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying it as a redirector link to known malicious infrastructure. Another critical heuristic indicates a large external PDF link farm, suggesting SEO manipulation or a phishing lure. The document body itself is heavily obfuscated and contains many of these URLs, likely intended to lead users to malicious content or to artificially inflate search engine rankings.

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://cctraff.ru/strik?keyword=abstraction+in+python+pdf In PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/2697538.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/rebodi.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/7061675.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/wijigomofiweb_lotitosede_jukis_dirum.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/4867245.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/zuvekazabuz-topofelo-gupolekodojavo-ponabiloxe.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/1/0434/8028/5348/files/dobitidozita.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9512/1301/files/58505981468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6708afd4-b07c-41d5-bc7a-3bd049f1ceec/zuzef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d31a58-05bb-4bc5-977b-fc3637a3b56d/zawinatunoreteb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5167d601-83c7-4e10-a5c4-eab7e90f1d81/jutugarusojakumaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72c88b80-f91d-4943-81d6-3040fb54654c/fupirisikuwu.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_off00005c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C75 5112 bytes
SHA-256: 739695a01ef13c4ad7fecb84747cd35af8cee4c327e5714f10ae0b9cfe17a150
font_01_sfnt_off00006db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB8 10068 bytes
SHA-256: 23ce613786468dedd78301ac08d0480b3da9dc2cce6cd4b15cd2857dd2d32a3a
font_02_sfnt_off0000903c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x903C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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