Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac391b85f4eac32…

MALICIOUS

PDF

42.1 KB Created: 2020-08-12 01:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd152315b11c01c54263521116dfd322 SHA-1: 8ee7931b327a04aeba5b622139ae5d308e4b3488 SHA-256: fac391b85f4eac321368c5fb5fbd5a011306ca1b5e99a32a5df5c15595d2d7de
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a 'Lenze 8200 vector system manual' and includes the malicious URL, suggesting a lure to trick users into clicking the link. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, further supporting the malicious intent of redirecting users.

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://ttraff.ru/wb?keyword=lenze%208200%20vector%20system%20manual
    • http://files.concept-well.com/uploads/1/3/1/8/131871462/fc4f63019.pdf
    • http://files.krecklaugermanshorthairs.com/uploads/1/3/1/8/131856877/xadis_pixojozaru.pdf
    • http://mulik.ashcancomicspub.com/uploads/1/3/1/6/131606505/1860258.pdf
    • https://cdn.shopify.com/s/files/1/0433/5363/7018/files/64428244130.pdf
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/maintenance_manager_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/4233/9992/files/jufomawopurojenolebizutil.pdf
    • https://cdn.shopify.com/s/files/1/0430/7428/9813/files/latomawuxepawizodusegu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1353/0019/files/paxek.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/tepukekuzidupolovevumu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.pdf
    • https://cdn.shopify.com/s/files/1/0433/6123/9192/files/bachon_ki_kahani_urdu_text_books_download_in.pdf
    • https://cdn.shopify.com/s/files/1/0435/7675/4344/files/vuwaba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jufozigazagapuji.pdf
    • https://cdn.shopify.com/s/files/1/0439/4464/0667/files/blue_sky_surf_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/9041/9620/files/tazagorafir.pdf
    • https://cdn.shopify.com/s/files/1/0429/8034/3961/files/58767155638.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000659b.bin
4b036718002effb0d37795b4fda6cafa9f6e09ff417542c17937642cb57c1895		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659B 5568 bytes
font_01_sfnt_off00007884.bin
128a696fdbfb74399ae95ad5705214d436f2c2c92a50e512bdb511c0da0a1807		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7884 10336 bytes

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