Malicious PDF — malware analysis report

Static analysis result for SHA-256 282b84c533fcb41a…

MALICIOUS

PDF

62.1 KB Created: 2020-10-06 15:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 185375ab08e11fbcbf9ba09d64a4f2c6 SHA-1: c78013be295021364f6c79c817e888f8e4f1f6aa SHA-256: 282b84c533fcb41a40182def443a84a5445e4a7549b07ec0e03b99411b0533da
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to journal author guidelines. The ML classifier strongly flagged this PDF as malicious, and the presence of a malicious redirector URL indicates an attempt to lead the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gettraff.ru/strik?keyword=european+journal+of+neurology+author+guidelines In PDF document text
    • http://files.gardenspotrentals.net/uploads/1/3/2/6/132681938/finefenusavat.pdfIn PDF document text
    • http://files.acquarieuno.com/uploads/1/3/2/6/132681300/6426638.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/1/0482/1735/8490/files/dikigegirexojimik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6138/6147/files/xojujigalel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3287/3626/files/families_of_the_periodic_table_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8004/7010/files/spiros_port_orchard.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7571/8299/files/30885335789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd908c1f-0097-4ee1-a894-a3ae56d88928/28100054308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6399d827-d156-439e-a0cb-4a9941001510/52499561734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26366052-01ac-4ae0-89ab-a904df607253/wuxoxikawomepunaguxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91f4f974-ac8a-4d59-97ba-76e40a563eb5/sosowuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65015afa-1b87-4eda-9b77-549380bddedc/mefumevowagapewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0412337c-cb46-47db-b7ab-2785a086b7b0/durenomuwataje.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_off0000b4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D2 5436 bytes
SHA-256: 7761525cf296030c2c38b47761a649d77984a4eaa70e1cf004a5292cbab59d4b
font_01_sfnt_off0000c75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75B 10564 bytes
SHA-256: 9f419a3a000fd1518291b1ae1eb5d2fecb3a77042d2486995fc77a0d6efbd92e

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