Malicious PDF — malware analysis report

Static analysis result for SHA-256 4731d66f09ac5581…

MALICIOUS

PDF

65.0 KB Created: 2020-10-27 22:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b14afd028ff63c983cf01056655526c0 SHA-1: 4b98553fc5a3d8dfb330910312d1981eec5e9957 SHA-256: 4731d66f09ac55815ccb5bb64e8daccd018176470dece9718430a23517ebc641
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous external PDF links suggests a link farm, potentially used for SEO poisoning or to obscure the true malicious destination.

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/123?keyword=choices+%2526+connections+an+introduction+to+communication+2nd+edition+pdf In PDF document text
    • https://lowizozexide.weebly.com/uploads/1/3/0/7/130776176/mijefiziwitudapo.pdfIn PDF document text
    • https://wilofera.weebly.com/uploads/1/3/4/4/134488721/607370d4.pdfIn PDF document text
    • https://tanezogifa.weebly.com/uploads/1/3/4/3/134321065/kimiw.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/6182291.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/966de493-aca6-409a-b5ac-b1b9daef483e/57561658725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a445c285-7f52-43d8-af96-83c5c8f42af1/18962663211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52bc940-1e18-4820-819e-42794a3a17a2/algebra_2_textbook_teacher27s_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d45455c9-98f8-4c8a-8df7-51f7a293261f/61280207925.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/79651486676.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/laralor.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/pepsina_bioquimica.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/simone_de_beauvoir_books.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/simemuwunadebadomemifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67118c02-96a5-453b-8b4b-aaebf19f9f5f/85025229662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3faf56e0-9166-444a-95d4-03621164c370/20424070463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d469910-7660-4a43-84df-bd583a7de9b7/saxifaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22b0315-9a7a-4f7c-8510-7597ead84e8e/37600741045.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_off0000bfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB7 4448 bytes
SHA-256: 8c924ad87d7343c80da758d5498fe47b2fe829c814761444b3b7c90d6cd33583
font_01_sfnt_off0000cec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 12012 bytes
SHA-256: 3898eaf9d9e2cef3a0a2c24569ef32597f7d9d5f6df27ae1e8dbac0025735241

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