Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f8b341c3f2fa4a…

MALICIOUS

PDF

40.2 KB Created: 2020-08-30 22:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce259b350cf4ab9c8c0383f05aae36a9 SHA-1: 3187a2282d5d8e39d85da24fa32b1593632401e3 SHA-256: 67f8b341c3f2fa4a9a34fcb111070798dfde58dabfaec80f5d8863f50eeba29e
94 Risk Score

Malware Insights

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

The PDF document contains an embedded URL that points to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics. This suggests the primary purpose is to lure users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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=punctuation+exercises+with+answers+for+grade+8
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6827/7404/files/ap_spandana_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0459/0531/3946/files/breville_smart_oven_air_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/48055949415.pdf
    • https://static.usrfiles.com/ugd/b8c837_9631e454f8c64eb89350741a13eb1129.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec3edfbd5ac74a0994f2828b8d9f8f64.pdf
    • https://static.usrfiles.com/ugd/a18aa6_b406c4fa4a7a4425a5a5452a43508fd0.pdf
    • https://cdn.shopify.com/s/files/1/0431/5385/0524/files/relationship_between_anthropology_and_sociology.pdf
    • https://cdn.shopify.com/s/files/1/0433/8479/9383/files/gilmore_girls_coloring_pages.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_off00005e01.bin
5dc22333df651a7596943cefbed00f396f691f903bd7aac29830b72ad9fe25bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E01 5604 bytes
font_01_sfnt_off00007121.bin
d3b783663ef0a67042f3c85bddbac91620be14ff6f99341d4eb0bc6439e24875		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7121 10324 bytes

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