Malicious PDF — malware analysis report

Static analysis result for SHA-256 433d92b191e866eb…

MALICIOUS

PDF

50.9 KB Created: 2020-08-06 13:40:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2194534485cce74b7d447a5ba7f3c7bf SHA-1: 28f6803a5f2e7e9876af5a9c90195eba30362855 SHA-256: 433d92b191e866eb03f62d96b94258d41fd6f832460b83e34fe14a7c49c6abec
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that is disguised as a resource for 'Arduino projects with code and circuit diagram pdf'. This link leads to a known malicious domain, ttraff.ru, which is likely part of a link farm designed to distribute malware or phish for credentials. The document body itself is heavily obfuscated but contains the same lure text and URLs. The ML classifier 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=arduino+projects+with+code+and+circuit+diagram+pdf
    • http://motazaj.kevinmbakker.com/uploads/1/3/0/8/130874431/zunimupubekepe.pdf
    • http://files.genefambrough.com/uploads/1/3/0/7/130775280/mezubok.pdf
    • http://files.beachtownrattan.com/uploads/1/3/0/7/130775676/fizen.pdf
    • http://files.wallartandpresents.co.uk/uploads/1/3/1/8/131857626/tegusibelesi.pdf
    • http://files.riversidehomemade.com/uploads/1/3/0/7/130775953/sobajup_xanapoxi_fulalep_vezopazo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0854/files/83501068825.pdf
    • https://cdn.shopify.com/s/files/1/0429/8869/9802/files/lowivuvanigokifipoguli.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/razikeruranofe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5428/4450/files/73752226844.pdf
    • https://cdn.shopify.com/s/files/1/0431/9949/6351/files/buvomewufizo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3873/5517/files/hide_the_pain_harold_thumbs_up.pdf
    • https://cdn.shopify.com/s/files/1/0431/3972/7509/files/puwafovifajinenupojarid.pdf
    • https://cdn.shopify.com/s/files/1/0437/5845/2897/files/rails_scaffold_controller.pdf
    • https://cdn.shopify.com/s/files/1/0438/3395/0358/files/40747020406.pdf
    • https://cdn.shopify.com/s/files/1/0439/4316/6107/files/zewifaluxakavexawigavone.pdf
    • https://cdn.shopify.com/s/files/1/0430/5793/8581/files/xegasawuruxumetizirolo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1653/5720/files/kenmore_air_conditioner_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8850/files/moxuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/24356095971.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000870f.bin
2047de6f9e74b4065e4a109c56e9c1601478c91ec187837b52c2209e3043bf1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x870F 5696 bytes
font_01_sfnt_off00009a5f.bin
d00fe8d0cafe40100afd8b502d82b6a6ad950ff48143ef01fb8567eecf63bdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A5F 10316 bytes

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