Malicious PDF — malware analysis report

Static analysis result for SHA-256 453726300ec510b5…

MALICIOUS

PDF

43.3 KB Created: 2020-07-09 09:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 6f2183600e6a2bdd44a05939f5cf4a57 SHA-1: d38a76b67f0ca58d90a7e89a39767a98a0e34f98 SHA-256: 453726300ec510b561efb232735595058b64ca93a758bf04bdb1480d2b42f320
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link that redirects to a malicious URL, disguised as a tool to remove PDF passwords. The document also contains a large number of embedded links to external PDF files, suggesting a link farm or SEO poisoning attempt. The presence of a 'Password-protected archive handoff' heuristic indicates that the document may be intended to trick the user into downloading a password-protected archive, which is often used to bypass security scanning.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ttraff.cc/wb?keyword=remove%20adobe%20pdf%20password%20online In PDF document text
    • http://files.dleonsmexicanfood.com/uploads/1/3/0/8/130874544/nudodama-soxixuze-dujevag-gasopovuv.pdfIn PDF document text
    • http://files.pack482glendora.com/uploads/1/3/0/7/130775751/zujekefuneta.pdfIn PDF document text
    • http://files.1911cigars.com/uploads/1/3/2/6/132695273/5c6d029.pdfIn PDF document text
    • http://files.theworldofmcewan.com/uploads/1/3/0/7/130738814/gibaja_tawix_wododibura_musimetal.pdfIn PDF document text
    • http://files.beeffoundation.org/uploads/1/3/1/6/131637034/dadigaguxa.pdfIn PDF document text
    • http://files.barriointellect.com/uploads/1/3/2/7/132740321/104c7d.pdfIn PDF document text
    • http://files.phoenixrunners.ca/uploads/1/3/1/3/131398075/fiwefosodawewov.pdfIn PDF document text
    • http://files.fusebreakers.org/uploads/1/3/1/8/131855992/wisiwuxobit.pdfIn PDF document text
    • http://files.westboroughasp.org/uploads/1/3/0/9/130969871/332115.pdfIn PDF document text
    • http://files.svhsculinary.com/uploads/1/3/1/4/131413905/1955363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tokatoxosi.files.wordpress.com/2020/06/gesisowogubibezor.pdfIn PDF document text
    • https://duxinum.files.wordpress.com/2020/07/8523628737.pdfIn PDF document text
    • https://tijitote.files.wordpress.com/2020/07/39249392655.pdfIn PDF document text
    • https://leniwibi.files.wordpress.com/2020/07/wederumaserefirizasoz.pdfIn PDF document text
    • https://xizipif.files.wordpress.com/2020/06/favoxozupubugu.pdfIn PDF document text
    • https://mobulozasa.files.wordpress.com/2020/06/43358353713.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ziwodukujaluladiludu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50878135704.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zemeletitofugawekabol.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_off00006b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9B 5196 bytes
SHA-256: d93dbdc4f181f626be249cb039716063655a5b2ccac28bf34bf29f5a5307fed8
font_01_sfnt_off00007d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D36 10216 bytes
SHA-256: 1d0b5e17023abdfd5162a6143465fb6ad4b68c35f909cdeb03164f95ebac2bfe