Malicious PDF — malware analysis report

Static analysis result for SHA-256 8831300410d1c46e…

MALICIOUS

PDF

44.7 KB Created: 2020-10-07 12:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 696b622ea479d26ff9a47fc15a9305ce SHA-1: 631b56e283d1468b6bc25c26bb05b3919f62f675 SHA-256: 8831300410d1c46e52f8f63c67fc1f4598ae72e365f2e39db49d2b917f297b69
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm designed to improve SEO for malicious sites. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is intended to trick users into installing malicious software disguised as a browser update or plugin. The presence of a link to a known malicious redirector further supports the malicious intent.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ggtraff.ru/strik?keyword=a+million+reasons+piano+sheet+music+pdf In PDF document text
    • http://files.nalaasda.org/uploads/1/3/0/8/130814124/8a8a29.pdfIn PDF document text
    • http://files.argobaseball.com/uploads/1/3/1/0/131070712/jogalu.pdfIn PDF document text
    • http://totosor.ncohoustontx.org/uploads/1/3/1/0/131070993/babitodumegu_fogonega.pdfIn PDF document text
    • http://files.pewtersky.com/uploads/1/3/0/7/130739704/zezumawenudokin-deparelebo.pdfIn PDF document text
    • http://kiteko.fitcoresmartmoves.com/uploads/1/3/2/8/132815787/9df4c37db5a7.pdfIn PDF document text
    • http://files.youliedance.com/uploads/1/3/0/7/130739076/tibobebog.pdfIn PDF document text
    • http://files.thegreatmoosemigration.com/uploads/1/3/0/7/130740193/3970290.pdfIn PDF document text
    • http://palugu.insolidotech.com/uploads/1/3/0/8/130814174/f82edae44.pdfIn PDF document text
    • http://files.zionhillbrookshire.org/uploads/1/3/1/1/131163563/silararitipu.pdfIn PDF document text
    • http://nogug.integrativewc.org/uploads/1/3/2/6/132682883/pitabemebidekogalo.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/1/0482/7014/7739/files/social_model_of_addiction_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7186/3961/files/lumumupixefifenozexevipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5612/3034/files/kingsborough_early_college.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6354/8833/files/jesus_teaching_on_prayer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1529/3093/files/mugowudekekozezaxifumaga.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_off00007005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7005 5384 bytes
SHA-256: 5fb9932fc99870aae3802def600f43f3a15944534a0306931bb92fcccab84a58
font_01_sfnt_off00008225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8225 10260 bytes
SHA-256: 0de5b763e4a061025ef968a33050dbfa4012221bfeb16abea9da0773934f077d

Open this report in the interactive analyzer, or submit your own file for analysis.