Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c72b321d38bc37e…

MALICIOUS

PDF

43.0 KB Created: 2020-08-09 16:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6234ce2765f766dad341f1f7600bc47f SHA-1: 42b1cc3e3d1d1fcaa180a44d07bdb03f971ce9f8 SHA-256: 5c72b321d38bc37e6ce3f7c1aa7e6bbab55187b2a57b46bd2ffdbb16371ef70c
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL https://ttraff.com/pify?keyword=biological+wastewater+treatment+third+edition+pdf. This technique is often used to obscure the final malicious destination and evade detection. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or redirection scheme.

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/pify?keyword=biological+wastewater+treatment+third+edition+pdf
    • http://files.midpacificowlrobotics.com/uploads/1/3/1/4/131454373/7625064.pdf
    • http://files.davidson-eng.net/uploads/1/3/0/7/130738921/jobideribuva_dujifibebudej.pdf
    • http://files.rachelpevsner.com/uploads/1/3/0/9/130969809/8903421.pdf
    • http://files.letspaintarabic.com/uploads/1/3/2/8/132814024/javojajesika_zifarivosux_jinun.pdf
    • http://files.patrickinpanama.co.uk/uploads/1/3/1/4/131438477/061d1a2c47642c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2311/3119/files/quizlet_gravity_hack.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/47554539811.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/thinking_architecture_peter_zumthor.pdf
    • https://cdn.shopify.com/s/files/1/0429/3984/2719/files/building_your_self_esteem.pdf
    • https://cdn.shopify.com/s/files/1/0431/9507/2674/files/waste_management_project_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/distributed_systems_papers.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6421/files/longman_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/laws_of_attraction_2004.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57379697448.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7732/files/20825963939.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/xoxogi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/4976603100.pdf
    • https://cdn.shopify.com/s/files/1/0430/6668/7642/files/solving_equations_and_inequalities_quiz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006912.bin
37925dd6da404c38950c193af556659cfcf0768a5a2766cd9d46594d77b30d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6912 5712 bytes
font_01_sfnt_off00007c6a.bin
ca13e4607e3906c6de5924d4d9d8b317cb1bfcd12d1ac781da79c25a97e2ba1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6A 9900 bytes

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