Malicious PDF — malware analysis report

Static analysis result for SHA-256 4feb383b2aac1e35…

MALICIOUS

PDF

43.7 KB Created: 2020-11-02 16:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7f7054e3a5c8cf082b434ada301768cf SHA-1: 8139b50817f314fa25efba3ba96a29b1e5363963 SHA-256: 4feb383b2aac1e3558844ca94018db97860bbf1578aedee31afa8ff3f9ce0bb1
94 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains a critical heuristic indicating a malicious redirector link. The embedded link, https://ttraff.cc/123?keyword=kim+hyun+jung, is the primary indicator of malicious intent, likely leading to a phishing or malware distribution site. No scripts were extracted, but the presence of a malicious URL in a PDF is sufficient evidence for this assessment.

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.cc/123?keyword=kim+hyun+jung In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_5f8d59cf13840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_5f9795d0e47be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_5f9cfaec67ea3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8075/1006/files/likugidometefe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1551/2479/files/kewavaguxevavema.pdfIn PDF document text
    • https://s3.amazonaws.com/rakonezum/malayalam_movie_torrent.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/24699625308.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/mcq_on_algae_and_fungi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5683/1905/files/free_bach_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/celebration_of_spiritual_discipline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9783/1588/files/riwajuwajajutiboriguvi.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/apprendre_le_franais_pour_parler.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_off000063cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63CC 4728 bytes
SHA-256: b70f36049c43d355cf1f5e24b31096af2d65b501221780df09a0791a2668ec36
font_01_sfnt_off000073da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73DA 14744 bytes
SHA-256: 6f00e296bd3909ffbd48e479b891d391c464dbbbe5d8c50aa8cc5a09237725a6