Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae14c957615ab96…

MALICIOUS

PDF

72.1 KB Created: 2020-10-16 04:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 99f92b1e8ad52d0b8a5fa33a4dac8026 SHA-1: 64f2114be2df624907a3d0523842a400c53becf6 SHA-256: 5ae14c957615ab96ebdbd0f41ab116841dc606d1b4694781e55212bbae085a34
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external resources, masquerading as a legitimate document. One of the primary links, 'https://cctraff.ru/123?keyword=statistics+books+online+pdf', is identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flags 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://cctraff.ru/123?keyword=statistics+books+online+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367627/normal_5f8748dae9d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5f87e64a0cb76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5f88ded12666c.pdfIn PDF document text
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/zojenokemaxow.pdfIn PDF document text
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/mijiku.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/f5d445.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/ff4f5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f05a2a5a-e3a6-4688-808b-7551b470515a/sazekanesikadux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0852/5989/files/simplifying_radicals_worksheet_algebra_2_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2186/0505/files/65346118498.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/4276/2663/files/us_history_chapter_12_and_13_test_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0307/4469/files/picture_to_apple.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0343/2088/files/100_complete_rdr2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4cd26af-ae1c-4345-9de8-c318849488d7/6858589737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c05bc92-1db4-4422-87a9-d5bc66c4a1c9/paxibabebemovopinafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94829470-829e-4788-84f5-cbc883881df7/keludad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2e92b6-2239-4afc-b983-a757fc9fce8f/14861377931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c55d397-6b44-419b-aec7-c55bd1d98814/ramigiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c4a10c-bfe6-4cfe-9c72-180eaffd8d06/nagomalagukosejamifiz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 5360 bytes
SHA-256: a4b815667d61573ae846cfc174b03fc5cac5d40006f7f72b05b86ffe02da9d8d
font_01_sfnt_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 10484 bytes
SHA-256: 5beb511eb966d432ab312d954680eee736fe928394259384ff2720cfc8136721

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