Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c96caa82212fac…

MALICIOUS

PDF

98.3 KB Created: 2020-08-10 03:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c90a6ec0f3203701254fd91ccfa8e3c1 SHA-1: 26036cb7f5eadab3328330c5760fd1b5d06c7b54 SHA-256: 66c96caa82212facc66cae6e803710e7a6a3f6bdd4c2b9f6cf9ac397d2dcb160
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a link farm designed to manipulate search engine results. One prominent link, 'https://ttraff.ru/pify?keyword=immunoglobulin+structure+and+function+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to disguise a malicious link as a legitimate search result.

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=immunoglobulin+structure+and+function+pdf
    • http://files.restonsusedbookshop.com/uploads/1/3/2/6/132695321/ziduka-fiwin.pdf
    • http://files.materialise-creativity.com/uploads/1/3/0/7/130776684/kafumawudufewewag.pdf
    • http://files.orenshabatlaurentblog.com/uploads/1/3/2/3/132303315/573650.pdf
    • http://files.guysalvidge.com/uploads/1/3/0/7/130776484/3943736.pdf
    • http://files.ravenlawson.com/uploads/1/3/1/4/131454620/fupapefesekin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1607/7991/files/network_marketing_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/7883/5606/files/history_of_great_britain_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/telisupuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/retib.pdf
    • https://cdn.shopify.com/s/files/1/0440/5959/0806/files/alison_diploma_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4663/files/cnc_machine.pdf
    • https://cdn.shopify.com/s/files/1/0438/3866/8965/files/biodiversity_conservation_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/vopofiletigikoxikulodupub.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/vowakanilokopuliferedagov.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4023/files/el_cazador_de_historias_eduardo_galeano_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/tidagixup.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/63594643004.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_off00014454.bin
55a93d6daf9c9f607190eee73c6260d64b6e83a701f66300c6c70b059ad56c69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14454 5552 bytes
font_01_sfnt_off0001571f.bin
e17e29d2970502be63d6ca7f8a9d20804b356bd353ba530d9062497037685a00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1571F 10724 bytes

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