Malicious PDF — malware analysis report

Static analysis result for SHA-256 92132a5295e88cc1…

MALICIOUS

PDF

45.6 KB Created: 2020-08-14 08:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32205793c872f69e4f360d39fecc95ae SHA-1: 575ea79d2ed255f4a8c17c533e0babd0a2ed3f44 SHA-256: 92132a5295e88cc1a72dd19a60a0ce2ebc8fde1435dad48af760ae03dbd7fc06
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on Shopify. One critical heuristic firing indicates that a link within the document, presented as a 'chemistry scientific notation worksheet answer key', redirects to known malicious infrastructure at 'ttraff.ru'. This suggests a social engineering tactic to lure users into clicking malicious links. The ML classifier strongly supports the malicious nature of this PDF.

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=chemistry+scientific+notation+worksheet+answer+key
    • http://files.meritcoffeetogo.com/uploads/1/3/0/8/130874254/3851829.pdf
    • http://nigibozan.abcchildbirthservices.com/uploads/1/3/0/7/130776023/vivexodelikadik_vinabepavewima_texetev.pdf
    • http://pavezuxaz.thepracticalnursepractitioner.com/uploads/1/3/0/8/130874218/latiwoteburuwo-zekonefanaji.pdf
    • http://ridekulu.savinggracearizona.com/uploads/1/3/0/8/130874642/20af13caf.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/24078203048.pdf
    • https://cdn.shopify.com/s/files/1/0429/6212/4959/files/81583570288.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/applied_mathematics_3_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/siwixirik.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3581/files/bar_plot_pandas.pdf
    • https://cdn.shopify.com/s/files/1/0450/4626/8054/files/bmi_chart_uk.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0815/files/novel_habibie_dan_ainun_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/klein_organic_chemistry_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0293/files/advanced_life_support_course_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/5585/6281/files/cisco_9300_stacking_configuration_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/libros_de_contaminacion_del_aire.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/casoni_test.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_off0000748b.bin
25eaf4b3789cf0fb8ae17c0eabd0e0df6be667381dfeed38cd5005db8a83c51e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x748B 5252 bytes
font_01_sfnt_off00008656.bin
1022f51d315deda478beb8caa401e9b4e7bdf21a85c9690bb2016d0e113dd272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8656 10148 bytes

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