Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbd209c8cb27ae5…

MALICIOUS

PDF

41.4 KB Created: 2020-11-05 08:36:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 11e17bc0fab7fb4198a8817ed390dde4 SHA-1: ef26fbb1692a45f710deb8e3f1e73c5c4cfc8bd5 SHA-256: dcbd209c8cb27ae519348d859803db03a5d72688f129435c1566e52d81f85bda
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://cctraff.ru/aws?keyword=2020+school+geography+bee+questions. Additionally, it exhibits characteristics of a PDF link farm, containing numerous external links, some of which are to benign-looking but potentially compromised hosting services. The ML classifier also strongly flagged this PDF as malicious. These factors indicate a likely attempt to direct users to malicious sites for phishing or malware delivery.

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/aws?keyword=2020+school+geography+bee+questions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4447084/normal_5f9ec3b8354f6.pdfIn PDF document text
    • https://zekuwatifakaxi.weebly.com/uploads/1/3/2/8/132815855/4640873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f9f732101937.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kekikefuwu.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/b5f22c74-b784-4906-ae88-fc5f4ba461f2/19884147860.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/game_operations_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/wutitoxogite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b92e919-ccc8-4546-8ec1-31d9163abe84/43386580065.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/sinanamupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c447ce23-30b2-499b-83ba-11b61d32b006/kikinopadosef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7349774-f89a-4dcb-ad27-6d55cef7b31b/62244536351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a99631-b72c-4985-9a0a-b87d9b11e623/cuerpo_sano_mente_sana_capitulo_7_cultura_answers.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_off00006279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6279 5744 bytes
SHA-256: 2109a3a3ffc8b8141db68d62a1ae5244f0a0f8ec61ca1e39f6904625df5d02c0
font_01_sfnt_off00007603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7603 10284 bytes
SHA-256: 1adeca295ad825cb26f07663fbe21c7a28bd9354fb8cf5031dd267e8911597da

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