Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbbfb5515f6bdaa…

MALICIOUS

PDF

47.0 KB Created: 2020-09-19 18:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f852154245201e4bb833bb78e677ff5 SHA-1: 222b4dff8e0d58219988cf9b5bd815501feea6a7 SHA-256: 7cbbfb5515f6bdaac41b797b571e1e9d530d033020d8f149f477167599ebdbc4
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL 'https://ttraff.link/wix?keyword=uhcl+transfer+guide'. The document body, though heavily obfuscated, contains references to URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=uhcl+transfer+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1fa74037-baf0-4531-a64b-765c67c3525a.filesusr.com/ugd/e0d0cf_92cc07ce8af5410ebd5257d1794a916e.pdf?index=true
    • https://4d5675b5-89bf-4270-90ef-8b800aea34d9.filesusr.com/ugd/2a1429_c803c11e68344646b98d869ca2d3304a.pdf?index=true
    • https://5028f01c-546a-49b0-9275-581f611284a6.filesusr.com/ugd/82d61e_25b87cb995524c9aa407c8e0949ecbd1.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0436/4120/8992/files/brain_abscess_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0434/8562/6520/files/sulas_voyage.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6315/files/wolazekutuminifomox.pdf
    • https://cdn.shopify.com/s/files/1/0469/4376/4641/files/sample_performance_appraisal_feedback_comments.pdf
    • https://cdn.shopify.com/s/files/1/0484/7642/2306/files/gogozuwoxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/56730540181.pdf
    • https://1e6ec04b-4f69-4264-8854-d5bbbcd18dd1.filesusr.com/ugd/40512e_40a55b9c06a249589e9a35c0de0c5cf4.pdf?index=true
    • https://5c027053-4772-4c2e-aba7-dd2d774d78e1.filesusr.com/ugd/dc8a8e_5f3b6f216a884b0ca6a2acff190d9713.pdf?index=true
    • https://8a55abe3-59b9-4ddf-8ab4-b5960789831f.filesusr.com/ugd/ce77c6_af18fa55e8e34d5eb92621eabf85585e.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062ea.bin
c64cf45237a46d1d6ebb410948cb3be771c9a2494cb1ad723c5f98c196a7d294		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62EA 5272 bytes
font_01_sfnt_off000074d2.bin
01e6b23589c04c5aa129eda22c55cc0105124e645095d904bb54d518428940c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D2 10568 bytes
font_02_sfnt_off0000992b.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x992B 16312 bytes

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