Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8769b2ab8130dd…

MALICIOUS

PDF

77.1 KB Created: 2020-08-23 15:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26b5219f7a62e397d5e9827927041d44 SHA-1: 74b98b4e04422780ff73ecb08a3b13b0244cc596 SHA-256: 8c8769b2ab8130dd7a3a1b244b22532a8a4240fe455a4f0bfd44acb6b3a927d7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=aortic+valve+calcium+score+guidelines'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary intent is to redirect the user to a potentially harmful site.

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=aortic+valve+calcium+score+guidelines
    • http://files.joraczewski.com/uploads/1/3/0/7/130775021/2903357.pdf
    • http://files.splendoraband.com/uploads/1/3/0/7/130776077/3b7ff891.pdf
    • http://nekoxezu.erskinebadmintonclub.co.uk/uploads/1/3/1/6/131606027/a4cbf250e208.pdf
    • http://files.fbministries.com/uploads/1/3/0/7/130776111/9e47a.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/nowenovopuwesu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1653/4685/files/66_lincoln_continental.pdf
    • https://cdn.shopify.com/s/files/1/0435/8127/6319/files/instagram_private_profile_viewer_gametoolkits.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/37636611793.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/sutujavulusupavidevug.pdf
    • https://cdn.shopify.com/s/files/1/0466/3033/8725/files/97657811371.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/insanity_max_30.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/material_design_library_android_studio.pdf
    • https://cdn.shopify.com/s/files/1/0434/6943/9141/files/tales_of_shiva_amar_chitra_katha_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9449/9743/files/dvt_guidelines_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/2013/9170/files/tcp_server_python.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuvitew.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8214/files/xemerogewilubixosowizud.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_off0000e4b4.bin
fc94d6bd412235f8b547c68d605cb778539a3a9d67812ae039e252fd187e833e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 5308 bytes
font_01_sfnt_off0000f6a3.bin
39d445be2242e066bcdd4bfd24f6ba776d019b637e15b83bcb1a427f85370b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 15504 bytes

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