Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88ba1f7b7fc12bb…

MALICIOUS

PDF

44.7 KB Created: 2020-08-16 22:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0f4eeb992fa820accd6811b648674d3 SHA-1: fed241d8abc3f63e1eb776f7c50dc6a74c6d7450 SHA-256: b88ba1f7b7fc12bbbff421b53fadbd735c32145c22d7a776371b0394be73999d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=dietary+guidelines+for+adrenal+fatigue'. This URL is presented within the document body, disguised as a link to dietary guidelines. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to malicious infrastructure.

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=dietary+guidelines+for+adrenal+fatigue
    • http://files.belchertownucc.org/uploads/1/3/2/6/132695575/wezawaxuki_koreg.pdf
    • http://files.aitorlajarin.info/uploads/1/3/0/9/130969708/618929.pdf
    • http://files.bencoga.com/uploads/1/3/1/4/131406811/7225718.pdf
    • http://files.howtocookweirdly.com/uploads/1/3/0/7/130738603/2802834.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4940/files/meaning_of_school_administration.pdf
    • https://cdn.shopify.com/s/files/1/0435/0479/5800/files/brahm_kavach_path_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5979/files/thinking_about_dilations_mathbits_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30611133668.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8289/0912/files/anton_calculus_8th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/gasidexemejewajapu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2337/files/kejed.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5502/files/frecuencia_cardiaca_archivo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/linorawuruwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/2287/6826/files/jotikaxebonerikedogoges.pdf
    • https://cdn.shopify.com/s/files/1/0432/0080/7070/files/feroroloxuxipanawewoboz.pdf
    • https://cdn.shopify.com/s/files/1/0440/6483/3686/files/sotezamugub.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/kovalozixepod.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_off000070eb.bin
43e742a7c0933b7ae9074b9cd26a7bc94729b2cc524110f9e7bea0ecdc1aa7b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70EB 5176 bytes
font_01_sfnt_off000082a4.bin
082b094711ad5502dce3c5288802e276f5c63e370eefc595d7dacd96603df5fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A4 10364 bytes

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