Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93ed3c63bbdcfe2…

MALICIOUS

PDF

132.2 KB Created: 2020-11-03 01:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 34d9fb68c475e8826f5a33b0174123ea SHA-1: d7125af6b676ce7fa2a4f6634ddfaf19fa7e3c80 SHA-256: e93ed3c63bbdcfe27a81458774b18a9a1b8ff4de4811065e91c27eb8d0e5ac4a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/aws?keyword=three+falls+elementary, which is likely used to distribute further malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=three+falls+elementary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5fa084f170d99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5f9a22156ef4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5f92e3bce2f0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f9898b4e0664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_5f9c9f8a49bcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f87309ec39e4.pdfIn PDF document text
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/mesopafomaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_5f8d55f6645e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/47060727171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27a75bf-bd63-4b80-ac7e-460dc9155877/bump_and_run_racing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/934a044a-ca10-4093-9833-35f18ce9c7a5/read_the_gamer_338.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_off0001ccc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCC5 5060 bytes
SHA-256: a89ef90714cc15faf29ea92073d1c51bb2c53c4c367f6a8b220be545f84830c8
font_01_sfnt_off0001ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDD7 11232 bytes
SHA-256: cf38db78e44c4ebcc5501872eca4ee543340ca547c3b13bf92dd5770b1b9b1ef

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