Malicious PDF — malware analysis report

Static analysis result for SHA-256 168a70de6853b74c…

MALICIOUS

PDF

40.0 KB Created: 2020-08-14 20:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b07538dc379a8f9edf3a84771d5cdb9c SHA-1: 7981cc00c3a161db8e56046db09982962dd61376 SHA-256: 168a70de6853b74ced5d57c59dfe156b8e418644262166466d9adf61896a7078
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, some of which point to potentially malicious domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to malicious sites via embedded links.

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.cc/wb?keyword=worksheet%20english%20for%20year%202
    • http://tiwejutuf.ditewigmorris.com/uploads/1/3/0/7/130739098/2590383.pdf
    • http://files.decibel-doo.com/uploads/1/3/1/4/131408942/9687912.pdf
    • http://gabapake.bigcreekantiquemall.com/uploads/1/3/1/8/131856149/firokafuwod_retiwumivum.pdf
    • http://wetaxilev.lilymariecreative.com/uploads/1/3/0/8/130814328/tozetareromoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2361/3595/files/karezulemomopigeli.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2332/files/anglican_hymn_book_common_praise.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6202/files/noaa_severe_weather_storm_reports.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/biomass_briquettes_calorific_value.pdf
    • https://cdn.shopify.com/s/files/1/0439/4146/2174/files/28685230414.pdf
    • https://cdn.shopify.com/s/files/1/0440/4133/9045/files/adverbs_of_manner_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1585/files/91237625054.pdf
    • https://cdn.shopify.com/s/files/1/0435/2815/9381/files/fish_coloring_sheets_for_adults.pdf
    • https://cdn.shopify.com/s/files/1/0448/4956/1757/files/integriertes_nderungsmanagement.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/7150824779.pdf
    • https://cdn.shopify.com/s/files/1/0452/5981/7117/files/problem_solving_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/8100/6244/files/45925882383.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/lurofikibaviduriwibisexe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3626/2052/files/abaqus_theory_manual_6._14.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_off00005ecb.bin
c42315a3f83ac9b3a7b5332be33e9681a9be70d44fb82f95f1e8b73f086f5cf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECB 5340 bytes
font_01_sfnt_off0000710d.bin
a7bf4210c866b8f742a0c32d61be8f836eb46d380da6ba86e04a36f5e9835213		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710D 10184 bytes

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