Malicious PDF — malware analysis report

Static analysis result for SHA-256 828b21ef4537476f…

MALICIOUS

PDF

54.3 KB Created: 2020-08-12 00:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da310e7be98ec0b323e0e5db15c1a5b5 SHA-1: da3a72607dbd3bf6c80591bb463c099ed261c090 SHA-256: 828b21ef4537476fdeb39159eb72689d5e09467fb2096b7ca8166fd3bc2e4244
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a tactic to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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/wb?keyword=exotic%20breeds%20of%20cattle%20pdf
    • http://files.shibashihighlands.scot/uploads/1/3/0/9/130969728/e3e2b544f8.pdf
    • http://puwezegi.clarobotics.com/uploads/1/3/1/4/131437619/8550711.pdf
    • http://files.iwstreecare.com/uploads/1/3/2/7/132740479/wogupu-zukokitoruwogog-zikezugufada-pubuzesilas.pdf
    • http://files.drinkdrankdrunkgames.com/uploads/1/3/1/4/131455247/tusod-jipel-zobuwarexa.pdf
    • http://files.jctelecom.net/uploads/1/3/0/7/130775292/89937ec0b0dbc55.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/entrepreneurial_university.pdf
    • https://cdn.shopify.com/s/files/1/0435/9330/2178/files/approaches_to_risk_management.pdf
    • https://cdn.shopify.com/s/files/1/0434/5636/4709/files/94661086986.pdf
    • https://cdn.shopify.com/s/files/1/0437/7506/6274/files/8838291493.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/vabodapetenirenosevaziles.pdf
    • https://cdn.shopify.com/s/files/1/0431/9087/8372/files/88174429003.pdf
    • https://cdn.shopify.com/s/files/1/0437/3551/5290/files/97147258547.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6413/files/genetic_engineering_articles.pdf
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/85829160003.pdf
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/74700733319.pdf
    • https://cdn.shopify.com/s/files/1/0429/3771/2806/files/accounting_quiz_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/9879/0301/files/pic_assembly_language_tutorial.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000801f.bin
6e54241e78302f9136ecd32ab69589b041936bd57432e3526afcb744f90a4b3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x801F 2164 bytes
font_01_sfnt_off000089f8.bin
2000fa89b79e6f4f4f4a8e083d60c8030e85927f48c609c0c2ee534ed02e1455		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89F8 4996 bytes
font_02_sfnt_off00009b00.bin
f0de758d6a9caa23b0cbe8d06077271553e52995ff1865039eaadac29639cdf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B00 10208 bytes
font_03_sfnt_off0000bddf.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDF 4324 bytes

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