Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edbcd6616079a47…

MALICIOUS

PDF

36.1 KB Created: 2020-08-12 02:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c56b7954c7cde41b972c89d173303b39 SHA-1: 34a252aa461be9cda4eab512e5e81cb2df78711b SHA-256: 8edbcd6616079a47d107e050b97d7d404525576137332cac2a1b8b9e9a1fd06f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=nutrient+agar+msds+pdf', is flagged as a malicious redirector. This suggests the document's purpose is to redirect users to malicious infrastructure, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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=nutrient+agar+msds+pdf
    • http://files.morgancountyillinoishistory.com/uploads/1/3/0/8/130814529/laburopagodeg_kaxova.pdf
    • http://files.twistedoakandco.com/uploads/1/3/0/8/130873820/2283531.pdf
    • http://files.gretchenhelmke.com/uploads/1/3/0/7/130776735/jolig_nomota.pdf
    • https://cdn.shopify.com/s/files/1/0435/8494/6333/files/vatobegesojejubitiguka.pdf
    • https://cdn.shopify.com/s/files/1/0434/3001/9237/files/asterix_la_cizaa_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0433/9918/4551/files/28112955295.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3212/files/wobema.pdf
    • https://cdn.shopify.com/s/files/1/0431/1721/5905/files/tajelakitasejofidojofo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5774/9917/files/pebowuretevosimevek.pdf
    • https://cdn.shopify.com/s/files/1/0438/3234/4736/files/68946020678.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/gaxigabiviganawerobikagik.pdf
    • https://cdn.shopify.com/s/files/1/0434/8598/6982/files/89013148627.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5480/files/kowedun.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/35646672988.pdf
    • https://cdn.shopify.com/s/files/1/0432/5690/5885/files/madosepidozan.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6909/files/andariki_ayurvedam_books_free_download_in_telugu.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000446a.bin
9c219c3d8af37d6af738fbbd51dda948537c783f6cf545573c41d550d0d28343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x446A 5072 bytes
font_01_sfnt_off00005589.bin
a0e6d209d3deed14cb6729f8964071cec0d951680fb1cbd2ba0b8b42558ebe79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5589 9364 bytes
font_02_sfnt_off00007596.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7596 4324 bytes

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