Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d163dbf3f7af9ec…

MALICIOUS

PDF

52.8 KB Created: 2020-08-15 03:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f520a786bbe11a2200b6a06c430d3127 SHA-1: eda4f8683d4e5f4603d1a8ea9ef30a0dd62f9629 SHA-256: 4d163dbf3f7af9ec84c07cefae00f6cf1241d5cd4022e83c24ee584beb8497fd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=aprendizajes+clave+preescolar+pdf+2018, which is likely used to distribute traffic or lead users to malicious content. The presence of numerous links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to drive traffic through the redirector. 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://ttraff.ru/pify?keyword=aprendizajes+clave+preescolar+pdf+2018
    • http://files.allunaskin.com/uploads/1/3/2/6/132681992/vetudituno.pdf
    • http://files.ps305.com/uploads/1/3/1/4/131454355/dimezonus_runowa_mivonibun_tivez.pdf
    • http://dupepo.remedycentralcoast.com/uploads/1/3/2/8/132814930/sexeba.pdf
    • http://nirujimi.chiropractic-now.com/uploads/1/3/0/8/130874655/4be666370.pdf
    • https://cdn.shopify.com/s/files/1/0438/5275/9200/files/58058489795.pdf
    • https://cdn.shopify.com/s/files/1/0431/4310/2613/files/dd_form_108.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0057/files/29945039784.pdf
    • https://cdn.shopify.com/s/files/1/0436/5585/6281/files/alcohol_120_for_windows_10_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/8210/4478/files/13366644436.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/71668477869.pdf
    • https://cdn.shopify.com/s/files/1/0432/2908/5859/files/67195723610.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/79605169803.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6240/files/53488897419.pdf
    • https://cdn.shopify.com/s/files/1/0437/7041/3207/files/14885319988.pdf
    • https://cdn.shopify.com/s/files/1/0433/9708/7390/files/7755442510.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7287/files/24625781436.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/nelson_mandela_short_biography.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008285.bin
c60de4b8123314267b17bc8013714118ebbc2d45fa508ef35efba278c49a3139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8285 5552 bytes
font_01_sfnt_off00009576.bin
f16ae452d5fc8353c6a29e0a301a3a53d0de2e9e49bc012a8c803b97c7ea687c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9576 10428 bytes
font_02_sfnt_off0000b790.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB790 4324 bytes

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