Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e17dbbe2599cdf2…

MALICIOUS

PDF

42.6 KB Created: 2020-10-27 07:51:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a0612a1ebb4ffa8e5cb548b75cc77e1a SHA-1: 2aa0ab143f132aa5e5bd990cef9eda0cb2ea2cf1 SHA-256: 7e17dbbe2599cdf29b47f091e9522dee88d441bbeea1fcff791df326b81ee826
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, ggraff.ru, which is likely used to funnel victims to further malicious content. The document body, though heavily obfuscated, contains the same malicious URL and a large number of benign-looking PDF links, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/123?keyword=ardmore+public+library+jobs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_5f91afe7d9060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5f8cf1d291f5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_5f8cbb9d7ab29.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/zofurifafo.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/fugudafiz-tutinexafof-fetefixumefisa-zigutiwub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ritoma/how_to_create_table_of_contents_in_word_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/national_geographic_magazine_2017_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/agenda_2020_para_imprimir_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/ancient_civilizations_of_north_america.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/goxujafefeterebifoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1caed480-1003-42ca-9a9a-1139c9164af6/tasaboridagup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546ab60e-4f17-4417-8302-9e51e1943563/23503460929.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/bewirose.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/siridaxavavefabovevatoni.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/wanubalaxuzejesofajojaw.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/accounting_standards_issued_by_icai_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/62167625757.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/amway_product_price_list_in_india_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/pearson_algebra_2_online_textbook.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_off000064b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B3 5524 bytes
SHA-256: d5442120008a5be262570915ecfa65913bae7647ac9793fb33f8e7a14f25715f
font_01_sfnt_off0000775d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x775D 11312 bytes
SHA-256: ca1facfded11b7c3a3fd6c338209da3477ddc36440abddda468e60fa69481712

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