Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4d0e52a3b75dea…

MALICIOUS

PDF

69.8 KB Created: 2020-10-06 14:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 75942eef17aac6b9df8e226dca4159af SHA-1: 92319853b4b79bb9bcea9b36e8710c155df83f46 SHA-256: bf4d0e52a3b75dea739a2fa4a08247df2f58de3e7d83d653738dd245912c3f83
102 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded JavaScript stream and a link to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL, which is likely used to host a secondary payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ggtraff.ru/strik?keyword=speech+de+ventas+ejemplos+pdf In PDF document text
    • http://files.redingtonvolleyball.com/uploads/1/3/0/8/130874018/57635.pdfIn PDF document text
    • https://site-1040399.mozfiles.com/files/1040399/mobogurejiwotimelikinir.pdfIn PDF document text
    • https://site-1043249.mozfiles.com/files/1043249/49019235696.pdfIn PDF document text
    • https://site-1040898.mozfiles.com/files/1040898/58223724076.pdfIn PDF document text
    • https://site-1036996.mozfiles.com/files/1036996/19736486769.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/1/0498/7453/4558/files/the_ring_weakness_in_the_hobbit_do.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/0298/2310/files/st_louis_county_marriage_license_office.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0987/8427/files/area_code_509_usa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9363/8822/files/82175298319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b362b24-b8fe-41bc-b3c3-d21643632f9e/xuxalukikiwexifetimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4982e68-55e9-4f7e-8d98-b1c7fe371925/10686737621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf8f4adc-307b-4df8-9d9c-83b1ea6d5bff/kezezowugojalimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/271cde17-5fdb-4e59-a7ca-009d0ce016ba/zupor.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8871 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off00009865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9865 5536 bytes
SHA-256: 6b800b1579db7d8640d37def3919fbe1065194fd8f2e56229ecb7dfd0772fed0
font_02_sfnt_off0000ab1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB1E 6672 bytes
SHA-256: dec7bf0123edf2dba37e9c2f951efbc6a9f2dc87a04ff593de72779e790a46d0
font_03_sfnt_off0000c2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A8 11724 bytes
SHA-256: 43eb6d1281ad07cfbf742be6263afefe6ac4451dbff000e2fef5ef496cfa5de7
font_04_sfnt_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 19948 bytes
SHA-256: 0bc9f4f809311979a21f3c7569b991575d40740788a5d2ccd87b1e8496e069c4

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