Malicious PDF — malware analysis report

Static analysis result for SHA-256 72252ac0567fa34c…

MALICIOUS

PDF

36.4 KB Created: 2020-09-06 07:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ed6b3b881ae59b7351226e364b60fdf9 SHA-1: bfe828f2806c8eba7168b5f0c57e31c6ad54d33c SHA-256: 72252ac0567fa34c1d84dcbb1ae4cd8cf9bf8e55013f24b32ab6a358f7789f81
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=amputee+rehabilitation+recommended+standards+guidelines'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Amputee rehabilitation recommended standards guidelines' and the malicious redirector URL, indicating a lure to trick users into clicking potentially harmful links.

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=amputee+rehabilitation+recommended+standards+guidelines 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/1/0437/8374/9789/files/tiregegusub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/9415/4904/files/guzaxado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/godilosomavumuxigareg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2411/4076/files/ice_barbed_spear_vanilla.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6622/0956/files/ccie_routing_and_switching_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8669/3023/files/prepper_library.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/diabetes_in_pregnancy_guidelines_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0594/3701/files/grizzly_hills_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/7918/9916/files/mitosis_and_meiosis_quiz_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46946939033.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9793/9349/files/gowedikewir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/7093/2390/files/borges_la_busca_de_averroes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4023/4902/files/algebra_nation_section_7_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/rupazeludagavajuxexoki.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_off00004e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E99 5616 bytes
SHA-256: 6ca0cd55f6f72a449b1f4e5acc659af4307bbf6b1853b953df7cdcbd5a34d46c
font_01_sfnt_off00006174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6174 10288 bytes
SHA-256: eb12a35ab135c18cb26e4a21cfa66d85e957ce0f168901814995b7bd0c609eec

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