Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c96ef6a4c7c79c2…

MALICIOUS

PDF

48.7 KB Created: 2020-10-08 18:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fd1d969a7e370594989fd7a0578abe31 SHA-1: f1677a6a725f17961a8936b49e5ef840a890ee1c SHA-256: 0c96ef6a4c7c79c2e3a000330ff9cc60bb78a3acb06c1bfe5e65cc8be08b9dac
132 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely intended to lead the user to download further malicious content or engage in a phishing scheme.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=terraria+red+ice In PDF document text
    • http://zakavu.cloudnetgocanada.com/uploads/1/3/0/7/130776791/9339141.pdfIn PDF document text
    • http://nuperof.emeraldtraceonline.org/uploads/1/3/0/8/130814328/gikujikediferu.pdfIn PDF document text
    • http://files.wellesleyconservationcouncil.org/uploads/1/3/1/1/131164023/wogalodeduzijo.pdfIn PDF document text
    • http://tumadidut.becomeacontractor.com/uploads/1/3/1/6/131606183/zufizinob.pdfIn PDF document text
    • https://site-1036826.mozfiles.com/files/1036826/7504685018.pdfIn PDF document text
    • https://site-1042622.mozfiles.com/files/1042622/romuned.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://cdn.shopify.com/s/files/1/0436/2056/5156/files/rhyming_pictures_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5567/5552/files/14740855427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c30da54e-2bbf-4d2f-ae65-cd2e67a3d0af/84876841899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b61752-1ef1-4dc9-ae2f-c828f6ee96c1/52414716732.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6233 4164 bytes
SHA-256: 121046d8bc6d77b117414c3961c0026d3b5f902c55ccf8949bdaf739a19d2766
font_01_sfnt_off0000704a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x704A 9960 bytes
SHA-256: 75f4d835c1efb895b70984c5c686abd0fe5df06227638c4fcd3e4d1868de322d
font_02_sfnt_off00009295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9295 16208 bytes
SHA-256: 3b60b84f554398af14c4ebb484939287515345ca9e6929e6e2fbb436f7be1588
font_03_sfnt_off0000a7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7D4 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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