Malicious PDF — malware analysis report

Static analysis result for SHA-256 3daf1ea206aba5aa…

MALICIOUS

PDF

46.6 KB Created: 2020-10-30 04:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c7ec5e09f099d1e2614e5bbfb20bd3b0 SHA-1: 3db21d8590be559f16d7d4a879320c0ed2ccb045 SHA-256: 3daf1ea206aba5aa88ea97f84eec9c947a1114bf2749a9e78b39ff6fb966bab1
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The ML classifier also strongly indicated maliciousness. The embedded URL is the highest priority IOC.

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://cctraff.ru/123?keyword=eagle+scout+letter+of+recommendation+sample In PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/batezumezesaragimil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_5f8bb94f5e7d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f88f5cbcd218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f8d00b8c14ea.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/titugome/auggie_and_me_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5d4dbf-26bc-4ad6-850c-fc6a3c939191/lujezurarekupatija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f40ecfda-d567-420a-b18c-902ada20c1c5/mesurer_avec_un_pied__coulisse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/848ec613-7509-4325-8b52-04a3034a565d/85194347090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2314/5896/files/59061878726.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/8256/5782/files/82627065197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/263eb939-3049-4cca-a58c-8c643bfecd27/40589215966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996b7281-0f0b-4516-9712-2562ac643f44/78527925814.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/4766939581.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_off000075ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75AB 5432 bytes
SHA-256: 72336ad9dbbda7cdf2d1702fe217e2d007703e40b5d188ede18050b9ffe65bd7
font_01_sfnt_off0000881a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x881A 10964 bytes
SHA-256: 54e91d9f926d6a6deec3c612c1f175fd48db73c0829260579c9364a53cf28f9d