Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf55da8bd609bae1…

MALICIOUS

PDF

42.1 KB Created: 2020-11-01 07:08:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 228c59c2f430c5d12d139e02d9a1b460 SHA-1: dc33dc497255bb78e9960d5af8587af4bba1ee46 SHA-256: cf55da8bd609bae117c809345a57912e5fc18b3dcf3276a9d50645258e40c3ec
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ttraff.me/123?keyword=full+moon+on+k+street In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418584/normal_5f98daabf1f8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_5f969b9dbed29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5f9c02eb9de54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5f9b8503300ec.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/wovigebi/vietnam_war_huey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55643ba-806b-4dce-b600-3bd6acf62e7d/rafilawotel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc33c953-7ac1-43a6-96e9-6dddc887d4fa/ada_shower_niche_height.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c58cc8-ffbd-4c11-8d16-8171ca3ff6ab/reparibemibene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/449b0760-2e69-463d-b78a-13fed58c3c31/napirokuwodevikidopubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23bfc9e9-0061-4f12-89ec-c723194260c4/1174697255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6632b935-121c-4aea-8342-7322ec4f0dbb/gaberipozupogativ.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0906078-6608-4fc7-97a7-513775f26af7/dojadefofuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e27d5c-005e-43c1-a137-164c14f9374c/luxafikiwimasowude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8ee251-7a44-4b68-a822-53568d1f6209/33672549695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f2625e6-b714-45e2-9b84-395eba4a414e/jagawavebaferidunos.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_off00006694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6694 4640 bytes
SHA-256: a757008cf15b8aab9777c404f2598eb3b24140b4bb7f01c1ef7f6ddeca4a0cb3
font_01_sfnt_off00007646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7646 11252 bytes
SHA-256: 3a78e5180e7d52554ee6b953a8e51fa11b0e13f2fecd3dd106a3cfe9f032dc00

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