Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15b864e9c32a5a5…

MALICIOUS

PDF

41.0 KB Created: 2020-10-09 07:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a3f2cd8ab96bf34271f1c396d564e8ae SHA-1: eab45353b19ef92eb4ac8fef8534076c14ac740e SHA-256: a15b864e9c32a5a55da06410218227ade4a9d7eaa4cdba48938d3f33f3caf7cf
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to external PDF files hosted on various domains, suggesting a link farm or redirection scheme. One URL, 'https://cctraff.ru/pify?keyword=clinica+del+doctor+edgar+contreras', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the structure and embedded URLs point towards a phishing or redirection attack.

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://cctraff.ru/pify?keyword=clinica+del+doctor+edgar+contreras In PDF document text
    • http://files.firebaughffa.com/uploads/1/3/1/1/131164474/fafefuzagapivevafeb.pdfIn PDF document text
    • http://degorire.provisionfes.org/uploads/1/3/1/4/131482812/6129830.pdfIn PDF document text
    • http://files.stanfordwin.com/uploads/1/3/0/8/130813639/wuritamirebew.pdfIn PDF document text
    • http://rexege.krisyforce.com/uploads/1/3/0/9/130969336/8036840.pdfIn PDF document text
    • http://vuvapoje.therisingcafe.com/uploads/1/3/2/6/132680926/8526446.pdfIn PDF document text
    • http://zikoke.eclmediation.co.uk/uploads/1/3/2/8/132814900/955582.pdfIn PDF document text
    • http://files.bodyworksnc.com/uploads/1/3/1/4/131453990/6388097.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/1/0495/9089/4755/files/roblox_firestone_department_of_homeland_security.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8447/0690/files/craig_slipknot_unmasked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3838/7607/files/equations_with_fractions_calculator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5145/6411/files/jijefomikurukivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44ac612-78d1-4187-88a5-b60194d1794a/66452765473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52b03d37-89d0-4f39-bfd1-faddc21db210/65707097696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c1301b-0400-4a31-8a31-5e9e9598bf4a/gumolemixunalamokijapuvas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23be9e9-7237-4942-97a0-48473c613f6a/bonexe.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_off0000641c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641C 5012 bytes
SHA-256: 5b3ed3287c9cb350d9ea51aa4a33242eb88f6125ca6b171e42f3d3c50bd9fd2a
font_01_sfnt_off00007531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7531 9844 bytes
SHA-256: de5f783c06b0f1b63194efbad9ca67cad1cf869da416173a7689b42c3868720b

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