Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b98c28f632a8948…

MALICIOUS

PDF

45.4 KB Created: 2020-08-17 02:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aed17ce00582077e089d5229cbb725ce SHA-1: d29921fa6a98d4327e39a41faaebaa42d91b0e40 SHA-256: 5b98c28f632a8948378f3172e654fca163b289292a67914784776c3f11bea3c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to Shopify, but one critical URL, 'https://ttraff.ru/pify?keyword=rudderless+imdb+parents+guide', is flagged as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute content. 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=rudderless+imdb+parents+guide
    • http://dinunot.acainhomecare.com/uploads/1/3/2/3/132302780/tezil.pdf
    • http://files.bancroftpfc.org/uploads/1/3/1/4/131406714/xamas.pdf
    • http://worar.highhillproductions.com/uploads/1/3/1/4/131408024/wekeleviwe.pdf
    • http://pinozej.strengthinstories.com/uploads/1/3/2/3/132302978/8ac4aa.pdf
    • http://sejuzolaw.marlitasvision.com/uploads/1/3/2/6/132682093/laxujamelizuma_fojepewimamus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/40364908642.pdf
    • https://cdn.shopify.com/s/files/1/0436/7355/1001/files/86470406507.pdf
    • https://cdn.shopify.com/s/files/1/0432/2417/0664/files/zanijimifamujuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/6815/2216/files/whatsapp_apk_mirror_2._12._194.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94430640368.pdf
    • https://cdn.shopify.com/s/files/1/0435/5329/2440/files/buprenorfina_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3586/files/55245036810.pdf
    • https://cdn.shopify.com/s/files/1/0433/5101/5577/files/xogerusipipeletojuvaza.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/abc_small_letters_writing_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/programming_language_pragmatics_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1287/files/here_i_go_again_drum_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/8217/6917/files/abigeato_significado.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000735d.bin
1e2f12cc64f84eecdb0294f51e8b1df3580c1bc798c68acd3f351ed2cbd4e618		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735D 5424 bytes
font_01_sfnt_off000085a4.bin
171eca40e7717254b6bc37ff5cd43148c84cc0031df3908e6a8bcbbfe5665045		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A4 10352 bytes

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