Malicious PDF — malware analysis report

Static analysis result for SHA-256 f983cbfc90c11f62…

MALICIOUS

PDF

63.0 KB Created: 2020-10-03 07:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 77181694a3f9ef9e149d71817bc2af7d SHA-1: d2c83466dcdb916cfb3ffa8480bf7302f6854088 SHA-256: f983cbfc90c11f6232e154075d09a432c86da502c579daaefc821749bbbc6613
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on suspicious domains. One URL, https://cctraff.ru/strik?keyword=hsk+5+vocabulary+example+sentences+pdf, is identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body appears to be malformed or obfuscated, but contains the redirector URL.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=hsk+5+vocabulary+example+sentences+pdf In PDF document text
    • http://suduzeri.angeecasson.com/uploads/1/3/1/4/131452893/cd2c01153b.pdfIn PDF document text
    • http://files.jerseygod.com/uploads/1/3/0/7/130739919/9c531.pdfIn PDF document text
    • http://files.paintingsadrianbradbury.com.au/uploads/1/3/0/9/130969976/fojopelevosiwud-rebabutamowogu-pabuxugudave.pdfIn PDF document text
    • http://files.stantonmathclass.com/uploads/1/3/2/6/132681855/wemuxebi.pdfIn PDF document text
    • http://norerum.alex-andonov.com/uploads/1/3/0/9/130969060/bezobadugesejosazob.pdfIn PDF document text
    • http://files.escalation.com.au/uploads/1/3/0/7/130738526/mutupijotivomobas.pdfIn PDF document text
    • http://labegobit.olivareslock.com/uploads/1/3/1/3/131380344/8c8247.pdfIn PDF document text
    • http://lolola.mossamy.com/uploads/1/3/1/8/131857920/xowozoluf.pdfIn PDF document text
    • http://jewew.examprepwebsite.com/uploads/1/3/1/4/131408027/ruxudib-dezimaj.pdfIn PDF document text
    • http://zagopugu.apronattitudes.com/uploads/1/3/1/4/131406444/cf101342.pdfIn PDF document text
    • http://files.unawestchester.org/uploads/1/3/0/7/130775379/vatilikunak.pdfIn PDF document text
    • http://files.guardianservices.com/uploads/1/3/1/3/131381031/gidesojedip_figikopikaxu_zolarodifa.pdfIn PDF document text
    • http://files.qlchoboken.org/uploads/1/3/1/4/131482833/furitatoxezaj-tevebomororikef-fuzus-wevuwe.pdfIn PDF document text
    • http://files.whatsmybox.com/uploads/1/3/1/8/131872070/xorixip.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/1/0437/4318/2999/files/22673445394.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3326/4806/files/94939029939.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9970/9333/files/warhammer_fantasy_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3544/6424/files/singer_curvy_8763_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6704 24616 bytes
SHA-256: 263c2cd70ca03edaf0b928f003ce6ac2efb0b76747ca2c6ca8cc9dabc0c466a9
font_01_sfnt_off0000b33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33D 5820 bytes
SHA-256: bedeb779d4e11f826645cc805b387e89deed55770e3b82df57478b2829c3bba0
font_02_sfnt_off0000c712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC712 13416 bytes
SHA-256: 54bf0813d492d29a3c0ee3e129e209c894af706552d7b2047e266cf641c6cd03

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