Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cded95e28b63c64…

MALICIOUS

PDF

43.4 KB Created: 2020-08-12 09:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaa1fd9e6d23ad15ff4ee727aba9576a SHA-1: 360314ebd751232a6f0d5048e2ea4a4a50043ff8 SHA-256: 2cded95e28b63c6487cf3d69f70fda44a95c6eee6e15a9e174a33bd7834482a6
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/wb?keyword=cours%20sur%20les%20droits%20de%20l'. The ML classifier also strongly flagged this PDF as malicious. The document appears to be a link farm designed to redirect users to potentially harmful sites.

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/wb?keyword=cours%20sur%20les%20droits%20de%20l
    • http://files.sitesbydane.com/uploads/1/3/1/3/131380128/13393.pdf
    • http://files.miltonjiu-jitsu.ca/uploads/1/3/1/0/131070799/1bb89a54.pdf
    • http://files.patersonsland.co.uk/uploads/1/3/0/8/130874238/baguzemi.pdf
    • http://files.practicalautomation.com/uploads/1/3/0/7/130740429/7385700.pdf
    • http://files.goldengoosefilmsinc.com/uploads/1/3/1/6/131606429/mebeledidigaguvi.pdf
    • https://cdn.shopify.com/s/files/1/0449/9157/8276/files/bsf_tradesman_application_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/24598181440.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/spreadsheet_formulas_excel.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/essential_organic_chemistry_bruice.pdf
    • https://cdn.shopify.com/s/files/1/0435/5761/7823/files/school_drrm_action_plan.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/tudodunobaruxinujabape.pdf
    • https://cdn.shopify.com/s/files/1/0429/3964/6108/files/tarukanifivefa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5545/6149/files/bukoki.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2279/files/33573001992.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/understanding_business_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/83060172161.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7776/files/83826192160.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/b._sc_2nd_year_chemistry_notes.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_off00006cb5.bin
30bba243b8c9d33a4319bdbf93bc0507aa166cf70047b641ad7a9a8aa96ca174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB5 5164 bytes
font_01_sfnt_off00007e32.bin
41e1fbcb999554557cdda801addcf7b5968884424edcfb100517d4a45edc75df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E32 10056 bytes

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