Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fe3f33112ff63d…

MALICIOUS

PDF

35.4 KB Created: 2020-08-29 20:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce282fa4fa5fe92d2a053759950387ec SHA-1: 2820785cfd3c262dc67fc75a9605c5727edc3cc5 SHA-256: 94fe3f33112ff63d2c50237f58060bede98c82400a8bb4d4969106ef7a978946
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious due to the presence of a large number of embedded links, including one pointing to a known malicious redirector. The document body contains garbled text but includes the URL 'https://ttraff.com/wix?keyword=conociendo+nuestras+escuelas+maria+bertely+libro', which is flagged as a malicious redirector. The PDF also contains a link farm of external PDF documents, suggesting an attempt to manipulate search engine results or distribute further malicious content.

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.com/wix?keyword=conociendo+nuestras+escuelas+maria+bertely+libro
    • https://static.usrfiles.com/ugd/eda9ba_f7bbf8e9c9904cb590def5ec8ab35219.pdf
    • https://static.usrfiles.com/ugd/565485_093efc5245034f83856bcf22d0461bf4.pdf
    • https://static.usrfiles.com/ugd/b8c837_70326a70e89b4679b8a42a9ed222a8a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_71122891b4c64d9488dcbdef0f8eca2c.pdf
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/88530319975.pdf
    • https://cdn.shopify.com/s/files/1/0436/1230/7618/files/convert_rows_to_column_in_excel_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26225030347.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5878/files/34117359491.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d87e6d813ea4411828a438f86427d85.pdf
    • https://static.usrfiles.com/ugd/8e1900_8436c0b76bc64959a26261aebaf3350a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000480e.bin
83a5a3c6f3d92603b78b450ee621d3ec25e08a6496479114a29d94733fed44af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x480E 5232 bytes
font_01_sfnt_off000059bb.bin
0717b16a6c32f95678ce7adae8dd492d889c082bcb1c144c53440d91b01e7c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59BB 11508 bytes

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