Malicious PDF — malware analysis report

Static analysis result for SHA-256 18319607f3df5afd…

MALICIOUS

PDF

39.6 KB Created: 2020-08-13 07:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33217e36fdc48d09371de6db7c4a4109 SHA-1: ea0f12e4933abe74b9feea5c5e0db27efc0fb0f0 SHA-256: 18319607f3df5afdda4c63a30ad0bd9a7286d15a590c575328f36318324060d7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'free halloween word search pdf', suggesting a lure to entice users to click the malicious link. The ML classifier also strongly indicated maliciousness.

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://ttraff.ru/wb?keyword=free%20halloween%20word%20search%20pdf
    • http://files.babybegreendiaperservice.com/uploads/1/3/0/8/130873820/vurajopefupal.pdf
    • http://files.lamosproductions.org/uploads/1/3/0/8/130873717/1a7b7e1baac280e.pdf
    • http://bibakurob.dmcihomesinc.com.ph/uploads/1/3/1/0/131070571/jotizupabuvozalowofu.pdf
    • http://files.erasingculturalgenocide.ca/uploads/1/3/1/6/131636978/rolewugusi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3635/9326/files/4888794705.pdf
    • https://cdn.shopify.com/s/files/1/0440/2446/3525/files/vamigatilix.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5885/files/38330916437.pdf
    • https://cdn.shopify.com/s/files/1/0430/6970/2306/files/94754830588.pdf
    • https://cdn.shopify.com/s/files/1/0434/9411/3446/files/gurutupemivajo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/dokod.pdf
    • https://cdn.shopify.com/s/files/1/0433/1978/7675/files/26017715993.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51851907441.pdf
    • https://cdn.shopify.com/s/files/1/0428/7728/8611/files/bimuxepasozufazol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95610310087.pdf
    • https://cdn.shopify.com/s/files/1/0428/8518/5702/files/fagen.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c18.bin
ca348b32be6fa8d1646819976c715ab676087ceee5543b74b25182b61d5cd58d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C18 5292 bytes
font_01_sfnt_off00006e26.bin
263e19f825cdeafc0da8d9d37ef5108abf2faccde0444a33c3116f223aef2270
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E26 10416 bytes