Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d4a82465400985…

MALICIOUS

PDF

43.0 KB Created: 2020-11-03 09:29:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e98650b98058db81fe67b7e3f2749548 SHA-1: 07b9f4a15cc5d3b7bdc252b05dc1f525b72c399f SHA-256: 70d4a8246540098534772d971257ff4b2fc8666eb44c70180ea99ae13515cf7d
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external PDF files, many of which appear to be part of a link farm designed for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a malicious workflow. The presence of a 'download' button lure further supports the intent to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/123?keyword=best+apk+mod+download In PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/turixawonako_pufako.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/venemi_raxatesugaze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5f9057a4503bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f8756320536d.pdfIn PDF document text
    • https://dudumopovidin.weebly.com/uploads/1/3/4/3/134308156/3cf1b16.pdfIn PDF document text
    • https://mixekolasum.weebly.com/uploads/1/3/4/3/134388380/nogaxufofaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5f886d642c8bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_5f9bdb6c7f061.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/varoximu/puximavirikekuj.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/52743813773.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7943/2347/files/gugugipajabuxokininujup.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/el_presente_simple_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/auld_lang_syne_robert_burns.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_off00006a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1C 5216 bytes
SHA-256: 5c7055d29be2383a9cfeaefe0c129367822e5b658a8fc6d5e23c10db2e2d1c1d
font_01_sfnt_off00007be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE3 10348 bytes
SHA-256: 7dd170b5133f05c37f12b8c65d38e7e00949cdf1871a431a359640b961cf6560

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