Malicious PDF — malware analysis report

Static analysis result for SHA-256 340b63dea82661a1…

MALICIOUS

PDF

40.6 KB Created: 2020-08-30 03:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9b3595d9d524286f084ba99267fe16e SHA-1: 5495285db28b8cd4986fc9e5dd401d0fd1efa9a9 SHA-256: 340b63dea82661a1586806705d84881bd610d7a2adfea4d6718620132db7fe10
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. It also exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify. The document body, though heavily obfuscated, contains the same malicious URL and benign-looking worksheet titles, suggesting a lure. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=quantifiers+worksheet+for+grade+2
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/pathfinder_settlement_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/92439572606.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0072/files/guxixifovedadozunetuwapix.pdf
    • https://cdn.shopify.com/s/files/1/0435/0876/0735/files/jebozowelodixiletif.pdf
    • https://cdn.shopify.com/s/files/1/0447/5797/5191/files/vadoguro.pdf
    • https://cdn.shopify.com/s/files/1/0432/5995/3312/files/marpol_73_78_annex_ii.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/aprendizajes_clave_tercer_grado_de_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0433/2086/9019/files/perimeter_of_a_rectangle_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/4648/3606/files/fotuzapowuxikaditugedoxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/xuxuzepizenulafimikiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6249/files/noviazgo_en_la_adolescencia.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3488/files/probability_math_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8968/files/jomurajidiku.pdf
    • https://cdn.shopify.com/s/files/1/0437/7876/9045/files/ronomifubegadowawagolu.pdf
    • https://static.usrfiles.com/ugd/b8c837_80a536615bd64cce9ba8fc579b7dd666.pdf
    • https://static.usrfiles.com/ugd/b8c837_7de735733adc4339b613910783c9cdb1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d68c0965a14c4a3083f3c9f0077d06fc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054c7.bin
593124b2576c29fb048ea976273d0193281576049ecd4596aa122125d8f5413d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54C7 5368 bytes
font_01_sfnt_off00006717.bin
7867a673ce4adc3161c830144a83ab8a8424be92f8e7364aa91d9861ee7a04a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6717 9488 bytes
font_02_sfnt_off00008779.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8779 4324 bytes

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