Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45f85788ba31da9…

MALICIOUS

PDF

41.1 KB Created: 2020-11-04 02:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: dc5fdc1c5d7b69b3de528982c6de4ed5 SHA-1: 0ec96e56399887a02085f7a9ab5be551bc9e7096 SHA-256: a45f85788ba31da9966d1ea3d68255379e96dc76301928e71a41e5ea5bc9f7c9
94 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, suggesting an attempt to lead the user to a malicious website. The document body and embedded link text mention 'Roblox mods download for robux', indicating a lure to entice users to click the link. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest potential for further malicious actions, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gettraff.ru/wb?keyword=roblox%20mods%20download%20for%20robux In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392191/normal_5f909f8eee75c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_5f9ef82c1d63b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404741/normal_5fa06b9754c8d.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/3768589.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/naranofinovujix/my_script_font.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3156f91b-9af1-401b-bd6f-0c0105be1c6e/julefetufavupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab61c430-85b6-491d-abc8-5b760457e1ea/wajep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5788/4565/files/53898544581.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_off0000621f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x621F 5360 bytes
SHA-256: 33de1df23a8784ed6f0521c241354cc2df52567415a2c8e4450dc7538a77d1b0
font_01_sfnt_off0000745c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x745C 10604 bytes
SHA-256: 06bdd4e1ea55ae4ffddd1beaf8f0c622ddbb051519fcbb0b017b840775aaa60b

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