Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa03b6578c51eba9…

MALICIOUS

PDF

70.3 KB Created: 2020-11-13 15:48:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06f4929ed7f2cb4d4ff2dd964818cc96 SHA-1: 55dbcc6c84468cc82bc7920773e028337eb530e8 SHA-256: aa03b6578c51eba9ec5d79e5b3da197221c8a3936a777e5f32b7aa2bf793e116
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 at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or a link-farming scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/123?utm_term=happy+birthday+hello+kitty+design
    • https://cdn-cms.f-static.net/uploads/4385859/normal_5f8fe8fa13a22.pdf
    • https://cdn-cms.f-static.net/uploads/4375076/normal_5f96c9765ecd6.pdf
    • https://cdn-cms.f-static.net/uploads/4381529/normal_5fa0128596ee8.pdf
    • https://menuwenuxunok.weebly.com/uploads/1/3/4/6/134682317/dojabezilapidi.pdf
    • https://cdn-cms.f-static.net/uploads/4445333/normal_5f9dd3a0f0175.pdf
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f8705d4e2e24.pdf
    • https://cdn-cms.f-static.net/uploads/4373992/normal_5f88df8145af2.pdf
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f8d1a8c80d59.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fumiposamisur/the_ruby_circle_read_online.pdf
    • https://uploads.strikinglycdn.com/files/e3a1d4dd-d837-46b0-b16d-0cdc94309f30/what_is_a_notice_period_for_a_job_application.pdf
    • https://uploads.strikinglycdn.com/files/fdb2106e-a226-4e56-ba0e-9623bc7956a1/soxokupu.pdf
    • https://uploads.strikinglycdn.com/files/19f360a3-0de0-4b10-ae2b-d3cb00551990/kozodiwukupafifofina.pdf
    • https://uploads.strikinglycdn.com/files/00b3e784-18fa-4086-8d6d-0a9c7dc32c13/4281480625.pdf
    • https://uploads.strikinglycdn.com/files/f66f4a0a-16d2-4749-bbfb-a72ea650e1bd/puritan_reformed_journal.pdf
    • https://uploads.strikinglycdn.com/files/86aac8b4-1a93-463c-8850-2d1f17e5acf2/entrepreneurialism_versus_entrepreneurism.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f7.bin
ae507997a6dd41ff23cf2ff926661a59371754e6af86fe53c4138db5cc40cd52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 5488 bytes
font_01_sfnt_off0000e794.bin
512c10e9a3ee0ba48819c69d38148188d3ad701be346114841c14228677ff018		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 10888 bytes

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