Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd2c69989b093e4…

MALICIOUS

PDF

41.5 KB Created: 2020-08-04 18:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 255aadbd23367fcc8d0ba4a06c1c57c4 SHA-1: 5c2e46d9e5cdd41d52dee1e81b3df39b1ad20351 SHA-256: 6fd2c69989b093e4ed0a12a196de96cba3b68e54ef8beb986383314acf7fc182
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. The primary malicious URL, https://ttraff.ru/wb?keyword=henrique%20de%20lima%20vaz%20pdf, is identified as a redirector to malicious infrastructure. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting an attempt to create a link farm for SEO manipulation or to distribute further malicious content. The ML classifier 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.ru/wb?keyword=henrique%20de%20lima%20vaz%20pdf
    • http://files.stpetersharbourlighthouse.com/uploads/1/3/1/4/131453574/4647872.pdf
    • http://files.x-amvip.com/uploads/1/3/1/8/131856161/93007.pdf
    • http://files.tinshedfarm.com/uploads/1/3/0/7/130739309/kiridowedupiwa_zuwupur_jotafopeviwo.pdf
    • http://files.davonloeb.com/uploads/1/3/0/9/130969294/4f4f502e90.pdf
    • http://files.kristinsfinefoods.com/uploads/1/3/1/3/131379554/falobojim-watadoro-veposu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8271/1201/files/69653124461.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1138/files/4912058048.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/11404650649.pdf
    • https://cdn.shopify.com/s/files/1/0435/2511/1972/files/vafatux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kikurum.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/minecraft_1._8._7_servers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34993807018.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/fisajoxinitad.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6653/files/23144813537.pdf
    • https://cdn.shopify.com/s/files/1/0432/6883/3436/files/wevexamarasamumitubi.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_off000060f7.bin
91df50408cc9aa03bc5be83cf0518ad4e078822b961e41e658a4193307370e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F7 5208 bytes
font_01_sfnt_off000072a0.bin
22bb1419531011ec51900912e99e8a5a60d4d5be4dfad37053fb81dd9b40e9e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A0 12284 bytes

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