Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc3be65624dcbe8…

MALICIOUS

PDF

41.5 KB Created: 2020-08-29 21:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09472f149c1bd0131cb3e0cbd08e0bed SHA-1: 0f87f77761b35667e6daddc34bdcc3b893b53000 SHA-256: 4dc3be65624dcbe8e854c38adef6ef5d53d21bac9de4494166c5cdef7eb2ed28
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link disguised as a download for 'Adobe flash version 8 free download', which redirects to a known malicious URL. The document also features a large number of embedded links pointing to various PDF files hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier 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://ttraff.ru/wix?keyword=adobe+flash+version+8+free+download
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/69014735696.pdf
    • https://cdn.shopify.com/s/files/1/0431/9546/5892/files/8326563985.pdf
    • https://cdn.shopify.com/s/files/1/0430/4768/2201/files/xadodataveloboba.pdf
    • https://cdn.shopify.com/s/files/1/0437/0772/8023/files/nitux.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/bilidel.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/xixugewir.pdf
    • https://cdn.shopify.com/s/files/1/0434/4781/2248/files/playtamil_new_movies_2019.pdf
    • https://cdn.shopify.com/s/files/1/0433/7179/0494/files/buku_biologi_sma.pdf
    • https://cdn.shopify.com/s/files/1/0464/6676/0856/files/73169744751.pdf
    • https://cdn.shopify.com/s/files/1/0434/5797/0329/files/27291257762.pdf
    • https://cdn.shopify.com/s/files/1/0429/7539/5993/files/barodimovidixikij.pdf
    • https://cdn.shopify.com/s/files/1/0436/3950/5056/files/aprendizagem_organizacional_concurso.pdf
    • https://cdn.shopify.com/s/files/1/0436/5107/2153/files/work_excuse_letter.pdf
    • https://cdn.shopify.com/s/files/1/0431/2301/5836/files/26483301107.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7621/files/bisectriz_mediatriz_mediana_y_altura.pdf
    • https://cdn.shopify.com/s/files/1/0462/6802/2941/files/veluwidojutubiso.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4829/files/wufijuf.pdf
    • https://cdn.shopify.com/s/files/1/0440/5490/4997/files/africa_in_world_history_textbook.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063c0.bin
2d4ee083728bc928a6c16df5271f1691217b56e37d5fae79e36a086d28e72e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C0 5468 bytes
font_01_sfnt_off00007668.bin
b387f107a870057911e6d1ab3fb10ca525cc7aa8c0572696fd33230e9654ea82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7668 10096 bytes

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