Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a8c534c8ff2adf…

MALICIOUS

PDF

45.7 KB Created: 2020-09-30 03:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 234154379f4458ae0f7cdf7223eaeee5 SHA-1: 7d326134c717d68964715bbb17e9dc09b633b6d0 SHA-256: 95a8c534c8ff2adfaf352d48ab68f2a01a30721e074529bace1e7247eed64703
192 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The presence of a critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing and the ML_NYX_PDF_MALICIOUS flag strongly suggest malicious intent. The document body, though heavily obfuscated, contains URLs that are likely part of this malicious distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=jaiib+accounting+and+finance+for+bankers+study+material+pdf In PDF document text
    • http://files.wabashcotobaccofree.net/uploads/1/3/1/6/131636886/2535527.pdfIn PDF document text
    • http://files.amiere.com/uploads/1/3/2/6/132680781/8031293.pdfIn PDF document text
    • http://files.acekitchensandwardrobes.com.au/uploads/1/3/0/7/130738607/midagit.pdfIn PDF document text
    • http://gepet.aspe-dc.org/uploads/1/3/1/8/131856754/mizoberakewi.pdfIn PDF document text
    • http://files.leftcoastinspections.com/uploads/1/3/2/6/132696406/nisawano.pdfIn PDF document text
    • https://site-1036969.mozfiles.com/files/1036969/82154467134.pdfIn PDF document text
    • https://site-1036975.mozfiles.com/files/1036975/xusimemurabesir.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/xipujaxumuzufonuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bf4d6a-ef0a-49e1-9d26-8eb42b604a7e/fudamasemofawoxor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa6cb85-6431-4eda-8226-e94c40bdbe0d/konalijelekubetusova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a22db97-5d4a-49af-b665-af258be453cc/bogeragovetexejatimok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0546ed9-6e38-4106-993c-bf39917cbc30/nuxanixonele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ccbc44-1be5-4a31-bd25-7bdf975e557c/40228490316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c254bec-dd0d-4ff6-907a-d938555ec721/dijagona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7955e817-875c-49a3-91b9-2065b9414627/79742784954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd476139-d143-46b0-930c-cf4ad9f6fbbc/temivukidibesajikupadarax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a03f87-c257-4874-acc3-a208a3162e0f/37427567804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990265ef-36ba-4f4f-8058-c92cab5c9c1c/50663166754.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_off00007263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7263 5768 bytes
SHA-256: 3eb408dbf1344c6e18583a21a2aa93fcfe80454a6f122805b7641683e42b66a0
font_01_sfnt_off00008603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8603 10344 bytes
SHA-256: 6f088cc9862b5186789d249ec6424e8bc5dfdcbf42621966c95d96c49c99a8cf