Malicious PDF — malware analysis report

Static analysis result for SHA-256 25dcdd932cb8e3f6…

MALICIOUS

PDF

34.8 KB Created: 2020-09-20 00:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a7af0bd27d0e462b0bba8c5722ff4b2e SHA-1: d26b68de7ba31cc5a28aea1640e92fdc7a7b4901 SHA-256: 25dcdd932cb8e3f63a7d642098c14f7c60fd22b1bf0ffcc6ea6b1eb31cb86836
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to Shopify domains hosting other PDFs, likely as part of a link farm for SEO manipulation. However, one critical link, https://ttraff.me/wix?keyword=what+is+a+relating+to+the+heart, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this malicious URL, suggesting an attempt to direct users to potentially harmful content under the guise of academic material.

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.me/wix?keyword=what+is+a+relating+to+the+heart In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/ap_calculus_bc_practice_exam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0456/4369/4247/files/49656829708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85583151980.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6880/1695/files/ziwef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/76532904956.pdfIn PDF document text
    • https://07680d96-f301-4c5b-9dff-96acb3cb803a.filesusr.com/ugd/03ae60_02e3c8b8eb6644f2a0da73f25c34ced1.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0151/2090/files/49838877679.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7960/6177/files/learning_english_conversation_for_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4227/4454/files/bandlab_apk_for_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/6779/5608/files/apologia_de_socrates_libro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8371/9071/files/48266856354.pdfIn PDF document text
    • https://3bd0cd33-defa-4cc2-be4e-c7bf493b243a.filesusr.com/ugd/2813e2_091d829dda9a424989663bd9dbc9ef80.pdf?index=trueIn PDF document text
    • https://b46a8587-d84c-4f12-a12d-dd98ba4685f6.filesusr.com/ugd/3e87bf_c12bad6836184605ba6cc2f1a28849f5.pdf?index=trueIn PDF document text
    • https://80413b14-c251-46cb-a7a8-2807388b7f22.filesusr.com/ugd/8508de_c9f2f9118dd0499890110848f9ed2a55.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B65 4960 bytes
SHA-256: 7a280c47c492dd2f038e35b58b9a7e17adf3d2519bdaa75114c0d17af75bd494
font_01_sfnt_off00005c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C4B 10032 bytes
SHA-256: 91acffadd3c4538740d37296b31a0a2584bf1c72d5143df4ad0d97c0fa3061f6

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