Malicious PDF — malware analysis report

Static analysis result for SHA-256 c284e3c7503bfa4a…

MALICIOUS

PDF

65.7 KB Created: 2020-10-19 21:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2a48929604579fe844a88511d5a47941 SHA-1: 4455617d741666282cf2aebd4a8cdfcf85bc215b SHA-256: c284e3c7503bfa4ae407022f6b8aab5035af9b7790841428c46b0a0de727c9d3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of embedded links pointing to external PDF documents hosted on various disposable domains. One of the embedded links directs to known malicious redirector infrastructure. The primary purpose appears to be SEO manipulation or distributing further malicious content through a link farm. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=gravity%20rush%20rule%2034 In PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/katilus-kolitumupogi-junipoxovak-zotesu.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/zonekagififeb_denules.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/tebavu_mofevuz_punoxibera_gijipomole.pdfIn PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/veledawakigomukurip.pdfIn PDF document text
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/zuwibivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5f8982d73fad4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f8bc4c9b88df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_5f8b2ae2b5ddc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5f8d51936fc04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_5f8b9ee522f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f8710fad361e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5f8c381b57aab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5f8a64ac353e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376612/normal_5f8ccf9f23ba0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_5f8d5f7618ad4.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/labitili.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/c0d8c11de0c2.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/9122198.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/lezukozikiwinenirib.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/36ce75ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_5f8823749aa45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f874a9cc7ba5.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/f2b92bbb29d484.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/kanibupopakuberasup.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/247258.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000af8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8C 5700 bytes
SHA-256: 7c7731cabedbb1f0495d2c3642747239627d0b80f83a1fa99eedc019c83c3a9b
font_01_sfnt_off0000c29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29D 5216 bytes
SHA-256: ea0b77bb015a768986a41789e3d511a801f924dadf61bcb3256cc254af9bed90
font_02_sfnt_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 10192 bytes
SHA-256: 72cf8ac897f39f24facedb4a3052424cbb264e18dcfea1128efe6ec871233215

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