Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c61e7313c6ed4d…

MALICIOUS

PDF

44.7 KB Created: 2020-09-17 10:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40bd79d13db80997923c01ee2e65ac90 SHA-1: b4f5cd5f7dc444e47c1ecf7c4fe8396e32295c7d SHA-256: 64c61e7313c6ed4dcc69a8e7e179f42a9b23a009ac4737790234c021ccda313c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that the document is designed to funnel users to harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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 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.
  • 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://ttraff.club/wix?keyword=coded+lyrics+worksheet+go+down+moses
    • http://nabokafoj.shopcompassrose.com/uploads/1/3/1/4/131406344/fbbe8f374.pdf
    • http://files.khfreeman.com/uploads/1/3/2/3/132302870/310682.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://58eb0fab-cf69-422c-ae48-413b449c7fa9.filesusr.com/ugd/d5d855_3e74f4014cff49df9e0e73ec93966969.pdf?index=true
    • https://7c8bfc6a-5158-4c43-a792-f6bb8122b648.filesusr.com/ugd/e50c99_e6418d7ccdd54010aeef84fd86b39645.pdf?index=true
    • https://8f2a93a9-e5af-4862-9dbc-463086f3e67f.filesusr.com/ugd/6924eb_01605b890eb6498ebd1be03eca2e83fb.pdf?index=true
    • https://ce9052cd-ba94-46c2-9993-81f35dce1d8a.filesusr.com/ugd/b6aaa0_baff9d0f9e254edb8defb1b8a049154c.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/7576/3353/files/fasavimagusabalakuwafig.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8775/files/96007125452.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/discussion_on_enzyme_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0441/3951/1960/files/45578568246.pdf
    • https://cdn.shopify.com/s/files/1/0440/6129/4757/files/titadojuraxudakezukimo.pdf
    • https://cdn.shopify.com/s/files/1/0441/1860/5976/files/97488662034.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/vobazujigineluf.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5811/files/champlain_lhin_medical_referral_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/8312/8214/files/nedeletiwanubila.pdf
    • https://cdn.shopify.com/s/files/1/0448/9238/9531/files/bisezukifadefiralu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f04.bin
fad97d86575f9cfb0b84f5828598119d91741cc8ec5cb5e8b13e50de50d72ae3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F04 5308 bytes
font_01_sfnt_off000080fd.bin
9ef6e839d1af9cfa8cda1eeaeb6f21eeb646cc96ac58477739bd9dd50c7483f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FD 10236 bytes

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