Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e56306bf179cb2…

MALICIOUS

PDF

47.8 KB Created: 2020-11-08 02:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2d17c3c7b4c85317bc0e457b9e1801c8 SHA-1: 13cd1eeeb6412b81e2c58d2252d35df43d1f0d33 SHA-256: c6e56306bf179cb29a1aa393ca910db22cf9bbb0e4f93cfe150fae6a0f63d11d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many pointing to disposable hosting or SEO-optimized domains, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://traffine.ru/123?keyword=minecraft+heart+of+the+sea+wiki', is flagged as a known malicious redirector, indicating a potential pathway to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.
  • 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://traffine.ru/123?keyword=minecraft+heart+of+the+sea+wiki In PDF document text
    • https://maxuvejalova.weebly.com/uploads/1/3/4/2/134265339/lifak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452385/normal_5f9f7a7a27bec.pdfIn PDF document text
    • https://xonujofepip.weebly.com/uploads/1/3/4/3/134385468/ramet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f9377b8757e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gefaxov.files.wordpress.com/2020/11/mercies_in_disguise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0fa911-1c04-48ab-bfea-ebdcec2a5b6a/6174616834.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/reremuradivuvevedivogobid.pdfIn PDF document text
    • https://batuvowu.files.wordpress.com/2020/11/download_harry_potter_and_the_prison.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44aba71f-3ee6-40f3-a09b-6a5b1bd82aea/18903210968.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/87142014259.pdfIn PDF document text
    • https://mudupetem.files.wordpress.com/2020/11/77662265609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57353add-5845-4dee-b68d-ddebc0196d1f/85164354975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e672e91-8881-4e92-951c-ce1773e9d215/bifuxunobexolamepuzax.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_off00005e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E6B 5100 bytes
SHA-256: 12c811a8f7de618a4304924d244714b79091bef1b2ace56cbb69b9ddcc484ad1
font_01_sfnt_off00006fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDE 14716 bytes
SHA-256: c1fe9c21a70a0511ee6882afc0631d510c016f982c43346a7c55964910e81c7c
font_02_sfnt_off00009da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA2 16036 bytes
SHA-256: ffcc099cb313ee7442755751e66ee5b466d1c2ae3a5aa4db1c7e493352985176

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