Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6753d71aaf3a09d…

MALICIOUS

PDF

40.7 KB Created: 2020-10-04 16:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 44fe45808f543b5404c2d66d1f730011 SHA-1: 5df8301a7f0e510d0d6d178d0827d1d74b121c70 SHA-256: a6753d71aaf3a09dc8b2a387f5c7566428886fd4c6c341b90648cf22a6d58e01
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lure the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious. The embedded link `https://cctraff.ru/strik?keyword=mis+sentimientos+err%25C3%25B3neos` is the primary indicator of malicious intent, likely leading to further malware or phishing content.

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://cctraff.ru/strik?keyword=mis+sentimientos+err%25C3%25B3neos In PDF document text
    • http://files.frostyvision.com/uploads/1/3/0/7/130739791/tiwetawi_sararaba_vuved_rimiseduniged.pdfIn PDF document text
    • http://fixev.classiquespa.com/uploads/1/3/0/8/130814416/d8f866d.pdfIn PDF document text
    • http://tavul.kidsorthok.com.au/uploads/1/3/2/6/132681296/dasijapidavalenisali.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/86a40456-52bb-409d-96ee-7357e4c2cfcf/79949988597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1744e50c-fb85-4b64-ab75-091b1ba54cd7/10392304429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/682e6c86-8ccf-4fd6-9432-992205dec5db/56646371662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad14a964-83a3-4a60-9a1c-6389d7e54b96/xosokufonilalufijebutegik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cdbc3d8-71dc-467a-8e21-dfa36eb769bc/vuxejoxibunuvulegepi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0157/5586/files/65167926602.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6554/3329/files/zigebelizojunate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1468/3813/files/38813502105.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8405/7243/files/tax_refund_calculator_2020_australia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9387/9710/files/70399061318.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/54205034814.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3942/0316/files/serra_high_school_san_diego_mascot.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6036 4732 bytes
SHA-256: 22ad3f47c5b6a7dbc39931baf2329684b23d40818bf5808badf14c005cd51af7
font_01_sfnt_off00007000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7000 11136 bytes
SHA-256: abc335ad1d222054a070c9ffc4cc693af740e02e646cb18e99567d3323c3c4c1

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