Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cab6aac49176392…

MALICIOUS

PDF

41.6 KB Created: 2020-08-06 20:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77f92a02f34e495ad777c98032fd9d86 SHA-1: fef45160460d08e33d80d0f613df94f947031437 SHA-256: 7cab6aac49176392a5779e4e097598bf56260d198e8785e249394b81b84aa563
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 of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a likely attempt to redirect users to malicious sites. 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.cc/pify?keyword=arkansas+dmv+book+pdf
    • http://files.lewisfp.com/uploads/1/3/1/3/131379113/8037294.pdf
    • http://sezogi.rachaeleggebeen.com/uploads/1/3/1/4/131482995/184c6f12.pdf
    • http://zulotu.menzieslawyers.com/uploads/1/3/1/6/131606552/dunuverepum.pdf
    • http://files.lightoftheworldbrigade.org/uploads/1/3/1/4/131452902/gogexejo.pdf
    • http://files.aidbihar.org/uploads/1/3/1/4/131452838/nirijufujefa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/65794734123.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/zavubelodawebufuvizijeju.pdf
    • https://cdn.shopify.com/s/files/1/0428/5222/1091/files/woralilivan.pdf
    • https://cdn.shopify.com/s/files/1/0440/2351/3238/files/jedavosi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8187/6131/files/breastplate_of_st._patrick.pdf
    • https://cdn.shopify.com/s/files/1/0437/2440/6935/files/rumuwuxevafixotupidumopi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9232/9116/files/46767882770.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/9345263424.pdf
    • https://cdn.shopify.com/s/files/1/0434/8585/5897/files/adyashanti_resurrecting_jesus.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1871/files/90764821337.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/vobapi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5901/2006/files/nanipazafibapapixodepam.pdf
    • https://cdn.shopify.com/s/files/1/0429/5108/2143/files/2010_dodge_journey_service_manual.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_off00006384.bin
ea66a7fb87072226f471c2746100bf86e7963de54360fb68c791d7b6bacc2cd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6384 5408 bytes
font_01_sfnt_off000075d6.bin
f6f2cb7fe6f87097d1df19a25d4b8163b3b8ac24561e1a52697ba077391520a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D6 10364 bytes

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