Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b6872a7f6c21d4…

MALICIOUS

PDF

48.4 KB Created: 2020-08-25 02:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5ab0ec1a64bda72ac38fa7eebf682476 SHA-1: c140af5863adef439661b4f1e29f1bba6fd18f78 SHA-256: f7b6872a7f6c21d482ef76b70186b826cd1b6d2e2f7a94785ae8747077967d5d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/pify?keyword=nice+cholesterol+guidelines+2018, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other benign-looking PDF links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the presence of numerous links indicates an attempt to redirect the user to external, potentially malicious, sites.

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.cc/pify?keyword=nice+cholesterol+guidelines+2018 In PDF document text
    • http://kolavakij.snyder-pharmacy.com/uploads/1/3/1/3/131380397/5ff8846b81.pdfIn PDF document text
    • http://jidisu.nataliekfit.com/uploads/1/3/1/4/131407406/tanajegokiloporudof.pdfIn 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/1/0434/7750/0057/files/corpus_christi_cranebrook_school_uniform.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9935/6324/files/format_sql_server_query_ssms.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/suffix_worksheets_2nd_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7897/4626/files/adjective_phrases_and_clauses.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7623/6950/files/70947772955.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/fevezatisopewewowikegol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/2007826840.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3040/5535/files/dagiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7063/5678/files/41393683715.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/5680/2461/files/attestation_de_stage_maroc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9148/3042/files/jurnal_aspirin_adalah.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_off00007f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F82 5480 bytes
SHA-256: 500bdbe187a048e25d1ec57a225a1f8c3f5a1af5d2ec80c17cb9b2c2faaa29a7
font_01_sfnt_off0000921d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x921D 10276 bytes
SHA-256: 7c36d43f11e8a162315cf0b8d9f0d3865cd890d46eebf6e576e0296e462f2302

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