Malicious PDF — malware analysis report

Static analysis result for SHA-256 79231d0c75ebeeeb…

MALICIOUS

PDF

52.0 KB Created: 2020-08-03 23:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38ba9a5cda4563107fdef8cea3e5abf4 SHA-1: c1a1e7aa343542d16dec27aaba2cef83ff3f9452 SHA-256: 79231d0c75ebeeeb466148fa22e0e421742839fcf28433d49361b66e1a726031
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=irrigation+types+pdf'. The ML classifier strongly flagged this PDF as malicious, and heuristic rules indicate it's part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains URLs that likely serve as lures.

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=irrigation+types+pdf In PDF document text
    • http://files.cedarburgtoyco.com/uploads/1/3/1/4/131407315/2932718.pdfIn PDF document text
    • http://files.hamiltonswcd.org/uploads/1/3/1/1/131163718/sejunib_miromupotuvu_tobekamekit.pdfIn PDF document text
    • http://files.mclcrd.org/uploads/1/3/0/9/130969873/zotidekaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9330/2178/files/accounting_information_systems_13th_edition_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1615/7344/files/cisco_ip_communicator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1306/3327/files/80169680018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1378/2173/files/24467093644.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/vugatowedebulotegokemem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/75678057405.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/21434749031.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/virimokevixudomuzezudo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8576/6561/files/49340052242.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9276/2006/files/black_rage_book.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008233.bin
2d3e56df4b192802b5c963572ab8da2b53da861fd94a63f2639cb3990c779ef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8233 5004 bytes
font_01_sfnt_off00009343.bin
904464423f47d6e466905f39e5f2e9dcc0b15ce3ca318b9ff26d6996b76ac12e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9343 10064 bytes
font_02_sfnt_off0000b5b4.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B4 4324 bytes

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