Malicious PDF — malware analysis report

Static analysis result for SHA-256 428f83826d1bcdb4…

MALICIOUS

PDF

39.9 KB Created: 2020-08-27 21:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0134296f2a891a8ff770e44b44282836 SHA-1: f15665a460110ebe0221f7dac144e1fca7ef5026 SHA-256: 428f83826d1bcdb428ada006f26614fd7cd7350df15ceb2018c6bd652e0e08c7
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to a known malicious domain. The document body, though heavily obfuscated, contains the same malicious URL. This indicates the primary purpose is to lure the user to a malicious site, likely for further exploitation or phishing. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=soledum+b%25C3%25A1lsamo+und+inhalator+prueba
    • http://files.weareantioch.com/uploads/1/3/2/6/132696044/pupolarozimux.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/14150262562.pdf
    • https://cdn.shopify.com/s/files/1/0434/0563/9836/files/15125362928.pdf
    • https://cdn.shopify.com/s/files/1/0435/2812/6618/files/53905961567.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7907/files/93078755282.pdf
    • https://cdn.shopify.com/s/files/1/0434/9086/9410/files/maxiscan_ms309_not_connecting.pdf
    • https://cdn.shopify.com/s/files/1/0438/0885/0081/files/lipid_peroxidation_2020.pdf
    • https://cdn.shopify.com/s/files/1/0447/5482/9463/files/bsc_physics_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4789/4683/files/appsc_general_studies_previous_papers_with_answers.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_off00005981.bin
d552505e5f728822771afe7da18d67228936930c5f35012ae8442e1d36a4359b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5981 5676 bytes
font_01_sfnt_off00006c03.bin
ebbc73f99027306ece1c4118ea61df3aa66affbf4b836b0be0622859ee5147cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C03 11292 bytes

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