Malicious PDF — malware analysis report

Static analysis result for SHA-256 663ba745eb0c702c…

MALICIOUS

PDF

46.8 KB Created: 2020-09-19 02:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b91f21b6be465e5ddf15a75f47b6a27 SHA-1: b5399454c7932340404a56b8c28c33f00d4f64f0 SHA-256: 663ba745eb0c702ca09069ac278274727e2e0256457af9df4bb2daca0791abe7
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO spam tactic. One of the primary links, 'https://ttraff.club/wix?keyword=birds+beasts+and+relatives+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs, reinforcing the malicious redirection attempt.

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=birds+beasts+and+relatives+pdf
    • http://rovoxelig.splashsteamboat.org/uploads/1/3/1/4/131453526/fipesoja.pdf
    • http://files.readwritebake.com/uploads/1/3/2/7/132740628/c53678bb2fd500c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fe99b54a-b682-4740-9828-dc71e237d6ef.filesusr.com/ugd/529dbf_ccfb31305f0444cfbe6abc850d37d3ba.pdf?index=true
    • https://ca90a857-fbb1-4ccd-b147-cbbb36e8df06.filesusr.com/ugd/866690_4714ec18124c4945a11d56006e846485.pdf?index=true
    • https://d0c2d09a-9796-47c5-9bc7-717a88088d12.filesusr.com/ugd/4f270c_2413acdf60b2473b8d2da0e311e14b0e.pdf?index=true
    • https://426c0614-c600-4782-9f96-25da24244f89.filesusr.com/ugd/417718_6389997c7d234dbc928976eee10eeaf3.pdf?index=true
    • https://c4c74e02-2fc1-4485-a7fd-1b1a657cd3ff.filesusr.com/ugd/221eaa_44e6f22348bf4488926f34a935046b19.pdf?index=true
    • https://d335d5e9-0305-45ce-b53a-0d914744b307.filesusr.com/ugd/cc089a_a196d22c4edd456a8c7b07259d105c73.pdf?index=true
    • https://7e0e0390-7f8e-4470-b196-e607c9673d0d.filesusr.com/ugd/b7ab08_c586c5c9a7fe4dfe8baffaa4c56600e1.pdf?index=true
    • https://23eea41b-64d0-44ae-a216-03d787e5ec6f.filesusr.com/ugd/f55bec_2da0249cad49452ebd9cf5c46a051354.pdf?index=true
    • https://a1cc6613-c221-4214-9400-929f79dd8125.filesusr.com/ugd/5dc3ca_c7ef757a5398414fb046c0e4bb066237.pdf?index=true
    • https://1fd6ba6c-b7d7-45b1-82e2-40cd1a75eabc.filesusr.com/ugd/01e791_55294376ee5c4350a68d56edf1f5145a.pdf?index=true
    • https://f73c215d-d127-43cc-ad25-9b0af58ffc7b.filesusr.com/ugd/008a9f_99777931942048da8cfc87979aedb535.pdf?index=true
    • https://ee09fd7d-6754-4a47-aa37-cfc233ee5c54.filesusr.com/ugd/f34823_fcd0e4aed30b447a91f488a4f29e0f04.pdf?index=true
    • https://e112f3d5-ebc9-4d5c-950b-0eb3298d134d.filesusr.com/ugd/7d2910_8808c65182c045d581200c5b9fb1bc49.pdf?index=true
    • https://5b7c1fcd-8081-4a44-ab70-bd43bbb34245.filesusr.com/ugd/b7306e_cec8d7ea8d184ff49e24233176e5b6ad.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079a2.bin
2c539009e531a1d9c27b4bfbef86d373598494d1113a4945931a4f76bfcbb4fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A2 5284 bytes
font_01_sfnt_off00008bab.bin
b05e7188f73eab029966902af44b9e5ddf757f3133259fc2443e318698af6923		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAB 10132 bytes

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