Malicious PDF — malware analysis report

Static analysis result for SHA-256 8449b5ea008b787e…

MALICIOUS

PDF

66.3 KB Created: 2020-11-21 18:22:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 316add9e93a0fe69dfcab96894044f42 SHA-1: 8eb9d1bc58f834955b8bc9907de833718a2c22a3 SHA-256: 8449b5ea008b787ee6a95a637ab620dd065d8f7c983d71e54ffdbd078c53874d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a link farm designed to redirect users. The primary redirector URL, 'ggtraff.ru', is flagged as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lead users to phishing or malware distribution sites, likely leveraging JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/wb?keyword=forecasting%20weather%20map%20worksheet#%201%20answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f875929e9042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_5faf37b2c8a33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_5f95fd71aaad4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373259/normal_5f9640aa191cb.pdfIn PDF document text
    • https://muborite.weebly.com/uploads/1/3/4/4/134442605/bidowew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413575/normal_5f9d09cbf1978.pdfIn PDF document text
    • https://rijumiwotoresu.weebly.com/uploads/1/3/4/4/134490354/zarekavedoxine_veloxojerez_golejanaz_fufanim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f88010f8e4ee.pdfIn PDF document text
    • https://fokomowopijav.weebly.com/uploads/1/3/4/6/134643156/terutogidopitune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5fa2cc4fb3fe9.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/kezemiradigu/japanese_for_everyone.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/polarity_of_benzyl_alcohol.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/pencak_silat_vs_karate.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/competency_based_interview_questions_with_sample_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/vujipudafuja.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/simon_stephens_plays_2.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/nuximalimuwajebu.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_off0000c5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DC 5428 bytes
SHA-256: 51b6ee867b101e5269bfc6edad8848582c1e2f609a605ca42209f24d575cbb83
font_01_sfnt_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 10580 bytes
SHA-256: be17c7709c451e0b40300915048a0043669f15905aeb36d3291cf66d3d215116

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