Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3df0d69b16eb13…

MALICIOUS

PDF

76.6 KB Created: 2020-11-20 15:37:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a3e8dad2fe4dfd1b8613f330dfe428ab SHA-1: 766572ee299cdc1896607c2d00b45b91d658149d SHA-256: 3f3df0d69b16eb136c80535951926c212d5e227069dbc5858901a468245cd5be
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, ggtraff.ru, which is likely used to distribute further payloads or conduct phishing. The presence of numerous links to external PDFs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself is being leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=jumbo+universal+remote+codes+for+ele In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5f9f8e7a1fef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_5fab954ddf25e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_5f8c1a4da26b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5f91cd6c2dc16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421333/normal_5fa53316c924f.pdfIn PDF document text
    • https://tigizojotajubum.weebly.com/uploads/1/3/4/4/134489046/93460f4c02eb.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/6431815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5f94803188fdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393647/normal_5f9d082fd98bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_5f996776d4796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5fa207ccd88d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427085/normal_5f9efd29df2d5.pdfIn PDF document text
    • https://ranaxeli.weebly.com/uploads/1/3/4/4/134478161/4ea27e.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/8f9ab0ef-5c87-4166-a6f3-3c5cc03b05e5/ball_python_morphs_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9603f1a-c150-4cb0-b3bf-ed65a3ed5676/80575390143.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_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 5356 bytes
SHA-256: ed0a02c096ba1860a0428e306e1af209b0ad402da1e7369efbcd933cae6a9292
font_01_sfnt_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 10476 bytes
SHA-256: 0c2cc4adf6fb05c5fac72e708b19d2e20fede0876380254b5fe81309fb3bd307

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