Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d38e9b7a75de39…

MALICIOUS

PDF

40.7 KB Created: 2020-08-31 07:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98437868c2a52a6a8b756e003205e8ae SHA-1: 67d94c996acf3de37247b531d1d2fcbafdb38dd3 SHA-256: 63d38e9b7a75de39b810311cde4a495182646a0d6597fb90823af1480658b689
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to tax collection and the malicious URL. The presence of a malicious redirector and a large number of external links suggests an attempt to lead users to malicious infrastructure, likely for phishing or malware distribution.

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=city+of+brockton+tax+collector
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/cb2bed_66a6ec0c183e4c80bff79f7bb82ca787.pdf
    • https://static.usrfiles.com/ugd/b8c837_313294f36f494534b0edf1813c446110.pdf
    • https://static.usrfiles.com/ugd/b8c837_defc6b83edfe4f118dac0f699719ecd3.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_48bcf856c9f849f88cc4735da7eda2d5.pdf
    • https://static.usrfiles.com/ugd/4d935e_ace881226e3b43d5ada482148cd28c8b.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_ee53be1ed1b741b7921f301204d376e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_63f930eeefe54607b2a09fbba739838f.pdf
    • https://static.usrfiles.com/ugd/0a593f_25d9c5f1e9084091975165eb2911252a.pdf
    • https://static.usrfiles.com/ugd/0c41e7_7b8b36bdc2e740fe9612dc2ee38d5e9b.pdf
    • https://cdn.shopify.com/s/files/1/0437/9099/1521/files/reruzozuwi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8217/6917/files/tutorial_de_ableton_live_9_en_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0430/5240/0793/files/sivarunilitunobivag.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/94551300956.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5561128363.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_off00005ff9.bin
2fc1e1d036bc5425f1715eb98339b76206478fdeff26baa1d31d47038516f501
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF9 4976 bytes
font_01_sfnt_off0000710c.bin
6deecef8b69ac8331538b3aecd0254f37138aa5c06c30c2e4f14f73a834382c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x710C 10904 bytes