Malicious PDF — malware analysis report

Static analysis result for SHA-256 13acf2f5afb8cd46…

MALICIOUS

PDF

44.5 KB Created: 2020-10-04 01:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cbaee2d6de62c0e4146a8c37af1c97bb SHA-1: 956f6d3a9ecd4fa8de7b0bf6fb80056eec57fef3 SHA-256: 13acf2f5afb8cd469f46cb273fca1fd4f554698058213d28b917497ce2828f91
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains the target URL, suggesting an attempt to lure users into clicking it. The ML classifier also strongly indicated maliciousness.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=free+lds+sheet+music+cello In PDF document text
    • https://site-1042198.mozfiles.com/files/1042198/22683312326.pdfIn PDF document text
    • https://site-1036816.mozfiles.com/files/1036816/17300153569.pdfIn PDF document text
    • https://site-1037106.mozfiles.com/files/1037106/polulot.pdfIn PDF document text
    • https://site-1037055.mozfiles.com/files/1037055/64419684501.pdfIn PDF document text
    • http://files.audreycurd.com/uploads/1/3/1/6/131637308/fawajozur.pdfIn PDF document text
    • http://files.gravediggersball.org/uploads/1/3/1/3/131380171/wufazoxebovomugu.pdfIn PDF document text
    • http://files.pcelpc.org/uploads/1/3/2/6/132683367/pegoxixowutun.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://uploads.strikinglycdn.com/files/84ad1719-f857-4102-a02f-04cc71f3ce30/9076473268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adfab293-5e43-421f-ab13-321144190a03/wulukusuzonigekube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c030a1-c000-46ad-a39b-caeea040be2c/87918558796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c888a08-08e0-4097-b7ea-0f801e115afd/67036006541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3c4c1a-6da1-4096-8b7f-7ac7cda31be0/4317139530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57518e8-e2d2-4e20-b4cf-c7298d55e9ef/83259859305.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_off00006541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6541 4700 bytes
SHA-256: bd811cba8ffb2ac56e9cdd4b4dd180e41cd31b522976c086b65050b96cebd544
font_01_sfnt_off00007539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7539 10024 bytes
SHA-256: ab006042b83cbe389c26414ced6d24494e1ce40d4a7c00dc83b222056dd861ef
font_02_sfnt_off00009780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9780 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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