Malicious PDF — malware analysis report

Static analysis result for SHA-256 1981baa6c8490b99…

MALICIOUS

PDF

73.0 KB Created: 2020-08-15 05:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00c719ac92bddb4d2e774682860a27d5 SHA-1: c3a2f08be64c3e4a0463ed49c0511ff8b8f492d1 SHA-256: 1981baa6c8490b994fe65a141fd1680ce1f8bd002c85436f7313a692f2815cf6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to disguise its true nature.

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.com/pify?keyword=border+around+bootstrap+form
    • http://files.ritchielawok.com/uploads/1/3/0/8/130873921/0e2a562b4360.pdf
    • http://files.jemmaday.studio/uploads/1/3/1/1/131164273/banobugatijane.pdf
    • http://files.balletfolkloriconwi.com/uploads/1/3/1/1/131164159/3461048.pdf
    • http://wefira.azzydoon.com/uploads/1/3/0/9/130969754/lovuvosu_ganajufu_wuvabogimijofi_xugewat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/bovazatevarupu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4170/2567/files/85522356287.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/kewovobo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3486/1987/files/all_biochemical_test.pdf
    • https://cdn.shopify.com/s/files/1/0438/2071/2098/files/56571304784.pdf
    • https://cdn.shopify.com/s/files/1/0430/3031/5159/files/60363389049.pdf
    • https://cdn.shopify.com/s/files/1/0429/5835/6639/files/gumapofisusaxidu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/73838640413.pdf
    • https://cdn.shopify.com/s/files/1/0434/0305/1171/files/75787910835.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/jijadotanabudolimu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3712/0933/files/jatuvepoduvanikevefodulo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0683/files/weighted_average_cost_of_capital_notes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c048.bin
74486e6692eec6228434ecaaec748c94a0d418ad1de56121d07ed078a4c6d868		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC048 5180 bytes
font_01_sfnt_off0000d1bd.bin
a574f5726119100de354cdaa2e2af19edde6a7aa0a7e0dbda9f5d7c5aba76cb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 17008 bytes
font_02_sfnt_off00010677.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 4324 bytes

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