Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99a5fa612a0f6b3…

MALICIOUS

PDF

43.9 KB Created: 2020-08-25 10:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbda165a6555a850643ebf46affae7dc SHA-1: eb24284955d02068cf595e1eecae318af2cbccca SHA-256: c99a5fa612a0f6b3f7cb5e3fa81466d41a6dd8693010b38cfa704abe5d800840
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm designed to lure users into clicking on a link that redirects to malicious infrastructure, specifically `https://ttraff.ru/pify?keyword=anthem+shbp+biometric+screening+form`. The document body, though heavily obfuscated, contains this URL, and the PDF structure includes numerous embedded links to various Shopify-hosted PDF files, likely as part of a SEO poisoning or link farm strategy. 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/pify?keyword=anthem+shbp+biometric+screening+form
    • http://vivovodi.theowlfrompowell.com/uploads/1/3/2/3/132302870/af89eb96fdaf.pdf
    • http://metev.evelandfarm.com/uploads/1/3/2/6/132681556/bigudowuke-givunupesigap-sufenepati-fabudepekirekib.pdf
    • http://files.helsbellshandmade.com/uploads/1/3/2/3/132303205/wegagagumejimo.pdf
    • http://files.houstonbottledwater.com/uploads/1/3/2/6/132695343/dudomedovosive.pdf
    • http://files.lambsworkshop.com/uploads/1/3/1/6/131636612/pitedupaperafa_jugisiwajif_wazetuf.pdf
    • https://cdn.shopify.com/s/files/1/0436/2492/3298/files/fesiliwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/kesun.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7462/files/gogowapetemilemodesefi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7128/2079/files/36220716891.pdf
    • https://cdn.shopify.com/s/files/1/0433/0301/0459/files/cateter_venoso_central_arrow.pdf
    • https://cdn.shopify.com/s/files/1/0433/3089/6026/files/76033730459.pdf
    • https://cdn.shopify.com/s/files/1/0434/0767/1448/files/jimerilinoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6658/9335/files/how_to_unprotect_a_word_document.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/3869688546.pdf
    • https://cdn.shopify.com/s/files/1/0435/5099/8679/files/bhakti_movement_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/pogaketiwakululidajavi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/bedirudaxalamurijizi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/38908279252.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/
    • https://cdn.shopify.com/s/file

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d48.bin
27b89e9516e8b502facf60eeb7e009d5bfa7c0265be3db78c353fe3b81a92baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D48 5316 bytes
font_01_sfnt_off00007f30.bin
ce96064cceab0c4e0c8e6a88f8cf70d071c621f924085757ea54d13c2576f084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F30 10384 bytes

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