Malicious PDF — malware analysis report

Static analysis result for SHA-256 665cf87a8e787b4d…

MALICIOUS

PDF

39.8 KB Created: 2020-08-29 13:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6d00f24caa23d786e049d5ca263e07f SHA-1: 1b970c27522b672224b0648c5a20c25088a80bb6 SHA-256: 665cf87a8e787b4dd7c9ad077ba609a6d9e66eda957bd91b1f57722285f7b29e
154 Risk Score

Malware Insights

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

This PDF file contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to 'math word problems worksheets 1st grade' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=math+word+problems+worksheets+1st+grade
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_60cf4f32dd214489bf745d655e20ad50.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b092887eafa442484de6f598e3e6a7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a08c401915e4bd18991ef63afac1668.pdf
    • https://cdn.shopify.com/s/files/1/0440/3780/0086/files/lezivotisemu.pdf
    • https://static.usrfiles.com/ugd/b8c837_e75a7c651e56461a906c270a2755499c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f68e2bddd5974249b1b08a81a4b195fa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/38769360886.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/worunadanipujatitebex.pdf
    • https://cdn.shopify.com/s/files/1/0427/8163/8812/files/green_belt_training.pdf
    • https://cdn.shopify.com/s/files/1/0438/5921/4496/files/boart_longyear_financial_report.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_off00005bc4.bin
63f068c9051f590f4571ace6e9b173711d45cdc1c87f73d79cbb753eb762ec7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC4 5724 bytes
font_01_sfnt_off00006f41.bin
e751b866a6478b7d6b57afa4cff3a9c3cf7f1732fc6cba578bd0d71b32f13728		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F41 10380 bytes

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