Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf9045c91b52cb6…

MALICIOUS

PDF

42.9 KB Created: 2020-09-08 08:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 13a3be7613894b0491d4155b5a9d6083 SHA-1: ad408afe8c689ff18ae71c5c2582f43be0780b01 SHA-256: 1bf9045c91b52cb678803b7534f28e26d9efa0b5c48c95bf1a0e56d7a85f482a
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://ttraff.club/pify?keyword=treatment+of+anorectal+malformation+in+newborn', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, indicating an attempt to direct users to malicious infrastructure.

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.club/pify?keyword=treatment+of+anorectal+malformation+in+newborn 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/1/0440/7099/4085/files/application_letter_for_study_leave.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/8888394920.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/85289337696.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5800/3096/files/chadic_languages.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9477/6739/files/adornos_navideos_2018_manualidades.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1775/6057/files/autogenics_3._0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_92488ebecacd42a48bb8969f0ff89d03.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c0a468_bef9994a076144be83f29e58fc3775c4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5ad03d_bdb257993914470992c6ae61db8e908d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/72ed28_1036ec828f4d456b8eb5e6d8bb8ae77f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_1df1a190979a48b48d564dcfd78b1f74.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c722c2_78700771d56b48bd9a980bee78f343fd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c83fdb_a16fd3fff8714a16ae82207a61b7e436.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/91e123_4f12ceb1f3bc459e8e4bad763339935e.pdfIn 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_off00006a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A69 5032 bytes
SHA-256: 72b05c6102ed90287fb6910d02256c4684a2c1bab23e79acbac22c154ea0bb82
font_01_sfnt_off00007b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B85 10228 bytes
SHA-256: e933b4f47c3d4b4b553b338791687d7a50b7325db1c8fb3dc1fb5996de1cd6b0

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