Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bec6861cd95485…

MALICIOUS

PDF

48.8 KB Created: 2020-10-02 21:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: fe4c8ab4aa37752eb51117a2e7eeaa4e SHA-1: 6b728c1efa3cfdebe497d292cb24bed458b2dbd7 SHA-256: 31bec6861cd95485180681fc76a13e80723099336771128c87f5dbd852861514
124 Risk Score

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=que+es+capital+contable+pdf In PDF document text
    • http://files.natures-cabinet.com/uploads/1/3/2/6/132696210/fikekamenomip.pdfIn PDF document text
    • http://files.chinahollandtravel.com/uploads/1/3/0/8/130874180/115477.pdfIn PDF document text
    • http://files.purduebap.org/uploads/1/3/1/4/131406846/7084024.pdfIn PDF document text
    • http://batobumi.workshoots.com/uploads/1/3/1/4/131438003/venunedalupomuneg.pdfIn PDF document text
    • https://site-1039893.mozfiles.com/files/1039893/88906663880.pdfIn PDF document text
    • https://site-1038658.mozfiles.com/files/1038658/xofavon.pdfIn PDF document text
    • https://site-1038901.mozfiles.com/files/1038901/95823883284.pdfIn PDF document text
    • http://vinoral.heartsower.com/uploads/1/3/1/4/131453453/sifigenuse-dezikeludafi-tosulanejefipi-lotofaxapulowi.pdfIn PDF document text
    • http://xesikozu.lorientoriding.com/uploads/1/3/0/7/130739298/xawobujadeb.pdfIn PDF document text
    • http://files.birdsofpreytexas.org/uploads/1/3/1/1/131164174/kolegopogurewel.pdfIn PDF document text
    • http://fukodifu.perthparish.org/uploads/1/3/1/3/131379295/miwonesubudunud_jopadalib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00007d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D77 5256 bytes
SHA-256: f15d4f70e25a41763b3dfd1522a90daea4fb0de0b164e49b7daa8a20c34bdbbc
font_01_sfnt_off00008f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F68 12208 bytes
SHA-256: 4bf1dc5e6bdd857912ee89b0525e243d19725cc8fbf60d32b57be7eb0bf92426