Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bbc381e801ddb4…

MALICIOUS

PDF

44.8 KB Created: 2020-07-28 22:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34354f95e6e5ce1642418de75a8b072e SHA-1: 8eb1c9a9c4b2dadc097a680cc523f53910cc7fe5 SHA-256: 92bbc381e801ddb473a12dfea4c494a107f9b743f2c1e820065b635453e5929b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link likely leads to a malicious site. The PDF also contains a link farm, suggesting an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

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.cc/pify?keyword=fiction+and+nonfiction+worksheets+for+kindergarten
    • http://files.floridaaquaticbiologists.org/uploads/1/3/1/3/131398250/6480983.pdf
    • http://files.soulcarecompanions.com/uploads/1/3/0/8/130813601/9abb0813.pdf
    • http://files.victorheritagesociety.com/uploads/1/3/0/8/130814169/mijudoseler-zorafuza-benudi-kuwuxo.pdf
    • http://files.westfielddentalpa.com/uploads/1/3/0/7/130775942/bavef_kezujuwusuk_javexolizepun.pdf
    • http://files.hanmaumchurchdfw.com/uploads/1/3/2/6/132696330/kuwoburub-wobeganeb-wisajoromivat-takotokosi.pdf
    • http://files.victorheritagesociety.com/uploads/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24863128440.pdf
    • https://cdn.shopify.com/s/files/1/0435/8189/8913/files/jikezarisugavowev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1847/files/puwezobanuxedi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7904/files/sexekobiwatedek.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/75513241993.pdf
    • https://cdn.shopify.com/s/files/1/0430/7147/1767/files/64552572500.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/95084864154.pdf
    • https://cdn.shopify.com/s/files/1/0437/2378/4360/files/24946903180.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/16010166272.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006908.bin
535f492466cce063674ae5034d4218a59bfd61fa5bc9f20770fdc66f703ed3ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6908 5152 bytes
font_01_sfnt_off00007a8b.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8B 1800 bytes
font_02_sfnt_off00008318.bin
c35d46c11c937688b564ceb2b9529747aac8ce7ea4da0acb25ed528405304af6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8318 10068 bytes

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