Malicious PDF — malware analysis report

Static analysis result for SHA-256 388041b5da1acab3…

MALICIOUS

PDF

36.8 KB Created: 2020-09-20 22:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 38772b6b9375bbb4bc9a7cc7181db9ce SHA-1: 8d9d3ee78cc54a3e14413bba33b0598d899dc6d1 SHA-256: 388041b5da1acab3904435244a4e0490c9604e976b35687b73dda989823532ce
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a large number of embedded links, many of which point to disposable hosting. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains several URLs that are likely part of a link farm designed to lead users to malicious content.

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://ttraff.link/wix?keyword=%25D0%25BC%25D0%25BE%25D1%258F+%25D0%25BF%25D1%2580%25D0%25B5%25D0%25BA%25D1%2580%25D0%25B0%25D1%2581%25D0%25BD%25D0%25B0%25D1%258F+%25D0%25BD%25D1%258F%25D0%25BD%25D1%258F+7+%25D1%2581%25D0%25B5%25D0%25B7%25D0%25BE%25D0%25BD In PDF document text
    • http://files.kaydeepuppets.com/uploads/1/3/1/0/131069763/kipetil-talusokuw.pdfIn PDF document text
    • http://fifimoxi.gerardo-jimenez.com/uploads/1/3/0/9/130968976/bedekunugimira_kuvuwiza_tikedubit_xifuxiraso.pdfIn PDF document text
    • http://files.digitaldelvers.com/uploads/1/3/1/6/131607712/7567029.pdfIn PDF document text
    • http://files.americafcunited.com/uploads/1/3/2/6/132695575/libawipisubewefap.pdfIn PDF document text
    • http://files.htateachers.org/uploads/1/3/0/7/130739043/829cd055e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71779a30-0112-44b2-9ae1-f07fb7291006.filesusr.com/ugd/97368a_60101aac530d4f828fbafbaa2883717e.pdf?index=trueIn PDF document text
    • https://684c1981-83a3-4bfa-a45f-534171b44a43.filesusr.com/ugd/72b0e7_650ddafe5d5a43488b87d5c272ebc734.pdf?index=trueIn PDF document text
    • https://dad02a4f-97b1-4615-943e-937e01ae585a.filesusr.com/ugd/ec0012_39bde7b9a42945ff9ea2da63d8c1ac8a.pdf?index=trueIn PDF document text
    • https://065904ed-164e-4c56-8fdc-624b8825dd74.filesusr.com/ugd/03ae60_5487753c94814947b6e3510aba277121.pdf?index=trueIn PDF document text
    • https://f3c01bbc-d51c-4b83-b88f-455626ecae26.filesusr.com/ugd/e9cba9_b17941100abe4fc591e8fd4de5633437.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7691/8175/files/density_of_wood_g2F_cm3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7435/5351/files/limerixorelo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/20558634471.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4972/2790/files/sed_replace_string_in_file.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_off000047ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47EE 5384 bytes
SHA-256: 6de619544d103ba0e285030c0d768a9fcc8e2c456f09c7e53be800286b92fef3
font_01_sfnt_off000059d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59D9 13552 bytes
SHA-256: 38486262df93a7af3c5785f58565b393875880d4dde92381eb1bab74e6821029

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