Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99b60c0d7480fd4…

MALICIOUS

PDF

42.9 KB Created: 2020-08-08 10:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b85fcca01693b0487c9aa90bd93baab SHA-1: 697021725fe68afd048e9b7b4d5b80c09060ac92 SHA-256: a99b60c0d7480fd4aba1b819b2f953dddeabfc94b837eba06c9ba2682162ccfe
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One of these links, 'https://ttraff.ru/pify?keyword=bivariate+frequency+distribution+pdf', is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and a large list of other URLs hosted on Shopify and other domains, suggesting a link farm or redirection scheme designed to lead users to malicious content. The presence of a malicious redirector and the sheer volume of links strongly indicate an attempt to lure users to harmful sites.

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=bivariate+frequency+distribution+pdf
    • http://defudo.saskatoonnutanalions.com/uploads/1/3/0/7/130738732/dezumanuwekorok.pdf
    • http://files.wraparazzi.org/uploads/1/3/1/3/131384359/9059944.pdf
    • http://files.grationlocation.com/uploads/1/3/1/4/131454808/499642.pdf
    • http://guwikifo.pbi-global.com/uploads/1/3/1/8/131871721/6584873.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/12457240824.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/36109867086.pdf
    • https://cdn.shopify.com/s/files/1/0434/3208/3612/files/oster_tssttvca01_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/1479/7981/files/evento_vascular_cerebral_gpc.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4967/files/53932769635.pdf
    • https://cdn.shopify.com/s/files/1/0434/2562/8316/files/administracin_de_empresas_y_organizacin_de_la_produccin_libro.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8772/files/98290698532.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/baredewasizuja.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/6895799208.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pexigubozorabavajodumixi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/how_to_write_acknowledgement_for_research_paper.pdf
    • https://cdn.shopify.com/s/files/1/0428/1909/2647/files/48216762592.pdf
    • https://cdn.shopify.com/s/files/1/0448/0483/3441/files/disney_the_replacements.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_off000064fc.bin
28ec361c68489071f7f876ec8d50f050681a32efb8feccd1377f925a59a55b5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FC 5592 bytes
font_01_sfnt_off00007820.bin
c560c2b167bc08e9da4e2db051ce6712d467ca5ce62b43f6cc3344566117da28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7820 11900 bytes

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