Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c6f32cef5fa3e0…

MALICIOUS

PDF

86.7 KB Created: 2020-11-14 20:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7654ba7b463d57ed95038caafcbe9415 SHA-1: 4c21224aaac604b80f967e0ad960fbb98a1da33d SHA-256: 56c6f32cef5fa3e0623d813c422257e8d33375140e87a921d0d25950a3bbf716
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs, particularly the one pointing to 'ggtraff.ru', are highly suspicious and likely serve as the primary mechanism for redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=worksheet+5+blood+wrap+ups In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f920bfea3d11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_5fa2c46a8f795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_5f95906120e07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386822/normal_5f9a7f9b78508.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/nimetodi.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/08962463-7e7e-45cc-a6b1-c84b011c57ec/39164011957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a3e325-f6d2-4fa3-8d96-a34ffe7c784f/57473006909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eadd141-a19d-4b8c-872c-62324b713d5c/dawijoba.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/mirenizotekuteliral.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a13efa9-4bf8-410a-ba45-b3a208a443e9/nutaku_gold_coin_hack_android_no_survey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d532dd7a-1a4f-45d0-8e87-1b1b417bac6b/coffee_enema_benefits_testimonials.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_off000115f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F3 5480 bytes
SHA-256: b10f92316f099a1c2fb1ad0f4e37257868ff60d9164b4943ded0bdf7b987b23a
font_01_sfnt_off000128a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A8 10996 bytes
SHA-256: 73827a869a0d0cb95b3aa5e0eac997e313c7d48813fc9f68df180502d174adbd

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