Malicious PDF — malware analysis report

Static analysis result for SHA-256 3663c1e918cbf271…

MALICIOUS

PDF

43.8 KB Created: 2020-10-30 00:58:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cb652736ad18b3fb7eb4ace63ee77b28 SHA-1: 15764cdbf8aae9de288a28403e1bdd5d9240b89c SHA-256: 3663c1e918cbf27123c22a8dd3cb22509477acf08b83f89acd8b54de496059e5
94 Risk Score

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.cc/123?keyword=change+font+size+bt+yahoo+mail In 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/6b0282ad-dd87-43f2-b86d-8206314f49b3/73392168644.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/zekowejogekizalixafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56860d90-394e-4b4b-9732-3293935c9c89/giwonikis.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/nudexilowila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e4d8e04-e770-4ed3-b125-0ae29faf68f5/jedoda.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/bederujatorolemopekopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/debdb7d0-c241-40fa-b96f-93a0fd5445bf/super_junior_ryeowook_girlfriend.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/13335571236.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/anemia_microcitica_pediatria.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/pengenalan_agama_islam.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/piano_music_books.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_off000068bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68BF 5280 bytes
SHA-256: dc6688b498adc89042f34cf30f67c6b86601efaeae26bb9e5131f664516e99b2
font_01_sfnt_off00007aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA7 12592 bytes
SHA-256: fd24e4b860a92f66f9d0ce6e3cd801fd09cb19019d298c9fc874645c6d7c4cca