Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8824152a15d6642…

MALICIOUS

PDF

55.1 KB Created: 2020-10-29 23:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fa8c4990c57714d4b6ee7c0369bd9bb5 SHA-1: 11246b599063bd6d25b5d23c71e2bc2290e2cb6c SHA-256: c8824152a15d6642a85ded5dbaa5912ed9ec0a7e855d93c000bed12c8baa0bc6
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector identified by heuristics, suggesting an attempt to lure users to a harmful site. No scripts were extracted, but the PDF structure itself is indicative of a malicious link farm or redirection attempt.

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/aws?keyword=a+koopa%2527s+revenge+2 In PDF document text
    • https://luleloneluso.weebly.com/uploads/1/3/4/4/134450102/b84374067506.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/pivabux_kadix_wexokuduwota_foxevofililog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_5f8b9beb76d3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5f8c39c96db5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5f89afb077ad0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_5f93b1ed1c8c5.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/1/0432/4782/9156/files/12047706338.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5448/7957/files/maths_textbook_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c564425-8cca-47ac-be57-17e256fd263c/nesufefopo.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/nugad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c4d4a93-1575-4ccf-9d64-e480cae1f56d/33801806264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97572c40-a834-4e9b-b80c-e96eb81d5474/konamusoxozirafirurato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/2866/6306/files/trainz_2010_thomas_content.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1e4bc0-f1ce-42a1-a917-bb4773b2608d/sinozabemozizitibonimu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a8bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA8BB 21676 bytes
SHA-256: 334336ef90974f3a3fa80867d5c76ab444a8b2f17f2e93779cf1f54697f862fe
font_00_sfnt_off000066ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66AC 5232 bytes
SHA-256: a386386d28456d7da3f309eb6c23ae34007f93babeaac2e6cbebf6b18cb41e6d
font_01_sfnt_off000078a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78A1 15820 bytes
SHA-256: c2b1ba10c11189d58d44967273f17beaa009cc6a8b7fbec79d147b1a110a412e

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