Malicious PDF — malware analysis report

Static analysis result for SHA-256 713b05b43f708890…

MALICIOUS

PDF

74.4 KB Created: 2020-11-02 21:47:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1c01093b95d9fa36a3b880a37859f2ac SHA-1: 7f602f5863f2be1f4bd4fefbe73f807430e38c99 SHA-256: 713b05b43f708890dab284004d3f7a54440d8bacefca383e68444ac646a21ce9
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 infrastructure, disguised with keywords related to academic answers. The ML classifier strongly flagged this PDF as malicious. The embedded URL is likely intended to lead the user to a phishing or malware download site.

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://gettraff.ru/aws?keyword=writing+coach+book+prentice+hall+answer+keys In PDF document text
    • https://gilepinewuje.weebly.com/uploads/1/3/4/0/134096317/06416578c7da80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_5f913d34cb85e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5f9bba1a116d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_5fa004f4ea891.pdfIn PDF document text
    • https://lajoreruxox.weebly.com/uploads/1/3/4/5/134588124/tipaxuwetimeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421051/normal_5f9711ea56a40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_5f9906d95ce07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f917fbc82397.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/1/0480/8428/7652/files/xebudifobadar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7881/8715/files/social_learning_and_personality_development.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6467/8807/files/creo_que_si_translation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4968/0032/files/9854317581.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3331/1897/files/palace_of_the_dead_ffxiv_unlock_quest.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_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 5608 bytes
SHA-256: 63bf0967d890ee91922ec833c3649f461e0c96b2d04c8ebe5fe8de3d28f439e0
font_01_sfnt_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 10192 bytes
SHA-256: b4d2e66c9565c5fdbf8c29cc2ffa863005b3f77ba5699b699100db8551281aec