Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be0db9785675c53…

MALICIOUS

PDF

47.2 KB Created: 2020-10-10 01:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 89c53735018390bde5dc1aeb275443be SHA-1: ca2a12773346cf238b51716d19fe6d6d3f8eb7cb SHA-256: 3be0db9785675c5370e26f2157e2c517f992a5dc3c360c2d2537fd473709109d
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, one of which, https://ggtraff.ru/strik?keyword=1917+pelicula+online+subtitulada+espa%25C3%25B1ol, is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links to benign-looking PDF files hosted on various platforms, suggesting a link farm designed to obscure the malicious destination. The primary goal appears to be redirecting the user to malicious infrastructure.

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://ggtraff.ru/strik?keyword=1917+pelicula+online+subtitulada+espa%25C3%25B1ol In PDF document text
    • https://site-1040431.mozfiles.com/files/1040431/jexazewo.pdfIn PDF document text
    • https://site-1043973.mozfiles.com/files/1043973/3776853241.pdfIn PDF document text
    • https://site-1038614.mozfiles.com/files/1038614/podufugikofoxilujerobeb.pdfIn PDF document text
    • https://site-1039332.mozfiles.com/files/1039332/23268767701.pdfIn PDF document text
    • https://site-1042725.mozfiles.com/files/1042725/dakufixojufolujanigamof.pdfIn PDF document text
    • https://site-1037022.mozfiles.com/files/1037022/defaxatinugaxiriwegopo.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/1/0478/0303/9903/files/testimonial_propaganda_examples_in_politics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/6947/6506/files/92908665308.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7537/9101/files/svn_resolve_conflicts_using_theirs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90c00bc-42c7-4e75-bb6c-0b78e89910b2/fivasogebukurerunep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1e098f-7ff2-4e4c-a36a-a210dc6ff8d8/11280465752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9502cf83-6f0c-4566-bbd4-d31bcd8c070c/21213694394.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDB 5516 bytes
SHA-256: 96d4799c77a6a3815a34ee08445da2f80ac7166718583c1097405ceb9ada0f7e
font_01_sfnt_off00006f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6A 11700 bytes
SHA-256: 3761dcc2d8b235da8611ee2ecc2e382317eb9b76e665cfa5ebda70f8dbea08bb
font_02_sfnt_off000095d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95D3 16904 bytes
SHA-256: 2d6462c05d9eb19646177445c8935241b4d3deed2851edfb692bd677bb8a9580

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