Malicious PDF — malware analysis report

Static analysis result for SHA-256 6427b09cb42e57ac…

MALICIOUS

PDF

37.2 KB Created: 2020-08-20 03:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d638a60815cb0eecba3570eb15f4289d SHA-1: 45e28a6a86c0f3c66ce1c9f877fee084aa7f0ba7 SHA-256: 6427b09cb42e57ac64ad365be8f8415f3b682ee8674bde577261c125f7c71946
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL to the malicious redirector. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing.

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=arduino+library+for+matlab
    • http://files.allamericanhousesitters.com/uploads/1/3/1/8/131871786/6762086.pdf
    • http://files.fuelbarhealth.com/uploads/1/3/1/0/131071056/8851286.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/check_if_child_exists_firebase.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/sql_report_builder_concatenate_fields.pdf
    • https://cdn.shopify.com/s/files/1/0437/6598/9530/files/25655398717.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/bsc_online_form_2018_date.pdf
    • https://cdn.shopify.com/s/files/1/0452/6505/9997/files/economia_ambiental_en_colombia.pdf
    • https://cdn.shopify.com/s/files/1/0433/5465/2822/files/triptico_sobre_alimentacion_saludable.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/tijozafogibolodupus.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/selomikaguv.pdf
    • https://cdn.shopify.com/s/files/1/0439/7416/4638/files/nipuz.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_off00005539.bin
9201f59aefa5d3c2e10338f95991de19c6ce5e80dbae49e83f18d4c248eb7063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5539 5108 bytes
font_01_sfnt_off00006684.bin
bb48629dff62ff43cc4a25ddebce21e3a8b30c2aec57ae0a1ba888c4666cf99a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6684 9976 bytes

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