Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42b7365b4b0caba…

MALICIOUS

PDF

259.0 KB Created: 2020-10-07 23:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2f36e20dff0dc9cb75dc951761d337ea SHA-1: 5455ff4f3201ab0dbf8222b7d06e406062b9ec19 SHA-256: a42b7365b4b0caba17cf431fab9a2a3d227d79ae0fcee785312546995a2d86e6
94 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for a specific PDF document, further supported by the ML_NYX_PDF_MALICIOUS classification. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ggtraff.ru/strik?keyword=introduction+to+psychology+plotnik+10th+edition+pdf In PDF document text
    • http://files.tgsglass.com/uploads/1/3/1/3/131379510/27b4d0e.pdfIn PDF document text
    • http://safutu.myfreedombookstore.com/uploads/1/3/1/4/131483281/a8b62319e8e8f.pdfIn PDF document text
    • http://files.jensensiaw.com/uploads/1/3/1/3/131398367/3a5c5d870ba7.pdfIn PDF document text
    • http://files.blessingoftheemeraldcoast.com/uploads/1/3/1/8/131857756/zujaxuxewewoj-riliwumivezes.pdfIn PDF document text
    • http://jexiwoman.eurekamakingadifference.com/uploads/1/3/1/1/131163943/boxiro-ronovudaxuk-wuzifetu-delugetitebi.pdfIn PDF document text
    • https://site-1043035.mozfiles.com/files/1043035/vewifojapavikaxudedasabet.pdfIn PDF document text
    • https://site-1040262.mozfiles.com/files/1040262/64860160782.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://linux.thai.net/plone/TLWG/thaifonts_scalable/In PDF document text
    • https://uploads.strikinglycdn.com/files/3526680e-ceaa-40e7-8224-4de68960f47e/widenemidorapurubifonev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/239a1e44-e563-4f7e-a481-3d67c6e3a4b9/97379252873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c7da1e6-c836-414e-a7f6-112b85a5b592/xezugeviraxijel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e2aa06-fa3e-4f6d-8779-d94f5b751908/fomaxerutujenedegejupaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7d8954-759f-4e45-9d65-14acec18512e/rebozorudadupasamad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d2a2e73-efac-495e-8012-43ba6919c971/lititewunozira.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003a0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A0F4 5504 bytes
SHA-256: ca4b2dd3acc8210a8f6aa40cafb1c7a008d4fc60cfa0b2b87f7258ca7d2b8518
font_01_sfnt_off0003b3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B3BF 15040 bytes
SHA-256: 6c7310429af8823cd89d3e9262448fed5fab8fcad02d53ec6b9255a68d3edf5f
font_02_sfnt_off0003e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E2DC 10096 bytes
SHA-256: 6106f4bdcdc66cc162403154a154e17aa8d241156f7f2e9b3c935a95a35f723e

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