Malicious PDF — malware analysis report

Static analysis result for SHA-256 437f41fb1c5fc2d9…

MALICIOUS

PDF

37.9 KB Created: 2020-11-04 09:06:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1ccfbcb24ff994fdc73a58cb45d7b58e SHA-1: 90a8797ddbf510532c8e43b1916455c7737f1e9b SHA-256: 437f41fb1c5fc2d9676c41c97bd2f2499b1301527562e668cc99b18ef7e055ff
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://cctraff.ru/strik?keyword=physics+classroom+waves+and+sound+answer+key In PDF document text
    • https://gejosabuvin.weebly.com/uploads/1/3/4/4/134457948/riwazatoze.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/jibepare-vudaramuzi-refirezagulele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f9914c895a8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377125/normal_5f8da6f174d28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5f907ca0ab456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_5f9312531335b.pdfIn PDF document text
    • https://kirasupi.weebly.com/uploads/1/3/4/4/134442552/7c1fb704.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/tadovu/6808524881.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/game_dev_tycoon_achievement_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1755929b-8860-40aa-8382-d39351832bd9/rinexaxevagomodurav.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/1998_ap_calculus_ab_free_response_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/the_way_of_zen_alan_watts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e4230d3-52ac-411e-b737-8d4721c6ea8a/bozew.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/gene_flow_and_genetic_drift.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_off00005529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5529 5500 bytes
SHA-256: 6474050301564758c89ccc106e5fe474dd005cf66153ad91dc782da550422b13
font_01_sfnt_off000067cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67CB 10468 bytes
SHA-256: 483b16e80acf38e6e62ac74b1f98c44ef3b6db0d4cc3d1075245f06f87c7cbe0