Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b52ebae4c5e6d37…

MALICIOUS

PDF

37.0 KB Created: 2020-08-13 23:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c242e904c6ec930fb0c7640012c9913c SHA-1: f0e1cb8faad5167b5d0828a0e4578e2fe53ea79a SHA-256: 7b52ebae4c5e6d3799bc2291a61a14814dfdc198bded506475fce37be1a129d8
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link to 'https://ttraff.ru/pify?keyword=kashi+amarnath+bhojpuri+video+hd'. The document body, though heavily obfuscated, contains references to this URL and other PDF files hosted on Shopify. This suggests a SEO poisoning or link farm attack designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=kashi+amarnath+bhojpuri+video+hd
    • http://xuxaduz.100crystalametz.com/uploads/1/3/0/8/130813330/zejazujuvug.pdf
    • http://jupeduji.ess-inc.com/uploads/1/3/2/6/132682883/sivoladati-gujakarirube.pdf
    • http://files.nourishingrootswa.com/uploads/1/3/2/6/132682048/6221942.pdf
    • https://cdn.shopify.com/s/files/1/0432/5048/3368/files/nulukelaneluwexij.pdf
    • https://cdn.shopify.com/s/files/1/0431/0423/9770/files/36560526839.pdf
    • https://cdn.shopify.com/s/files/1/0438/5685/5190/files/tutorial_arcgis_10._3.pdf
    • https://cdn.shopify.com/s/files/1/0431/9897/2066/files/zazox.pdf
    • https://cdn.shopify.com/s/files/1/0430/9604/7783/files/bioreactor_for_plant_cell_culture.pdf
    • https://cdn.shopify.com/s/files/1/0430/5970/8058/files/48053109679.pdf
    • https://cdn.shopify.com/s/files/1/0451/7930/6135/files/ophelia_lumineers_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/consultant_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/6487/7471/files/31969964506.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/pefejudakomidenoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6839/1591/files/tudepilasowa.pdf
    • https://cdn.shopify.com/s/files/1/0429/4184/1571/files/19085522196.pdf
    • https://cdn.shopify.com/s/files/1/0433/9944/6693/files/67882204069.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_off00004948.bin
c399558e7bf10fff5cfa28f36621d95f89a1f99a32f170486473b21978213dfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4948 5412 bytes
font_01_sfnt_off00005b83.bin
ce5b0b44905d9afc9ae14302892673766d4687fa8ee130e6d5fce3e5e89c3fa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B83 14008 bytes

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