Malicious PDF — malware analysis report

Static analysis result for SHA-256 668a300b909106c5…

MALICIOUS

PDF

45.9 KB Created: 2020-08-07 00:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c7e9f3390283eb649e5d0b6187c5bbb SHA-1: 6f5e49f65766bbcd9089e0931229a39319d8fb3c SHA-256: 668a300b909106c590a1dc70e273ee7ca6e176717a3cb1ee580420785ee84654
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many of which point to external resources. The primary malicious link, 'https://ttraff.ru/pify?keyword=analise+combinatoria+questoes+resolvidas+pdf', is identified as a redirector to malicious infrastructure. The document body, though heavily obfuscated, contains this URL and others, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious.

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=analise+combinatoria+questoes+resolvidas+pdf
    • http://files.gordoncentralperformingarts.org/uploads/1/3/0/7/130740530/zebuwepepujogit_nezujiguluxew_zetujexozonimex_wikudesa.pdf
    • http://zokokowit.zenwich.us/uploads/1/3/0/9/130969754/tepipuliredulusab.pdf
    • http://files.giannibasaglia.com/uploads/1/3/1/3/131380083/db07f68f71c.pdf
    • http://files.fieldmarshalmontgomery.com/uploads/1/3/0/8/130814402/bewerozivovutoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/wevopaxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8262/0834/files/58055646743.pdf
    • https://cdn.shopify.com/s/files/1/0431/3566/4284/files/fatima_apparition.pdf
    • https://cdn.shopify.com/s/files/1/0438/2110/5309/files/73146443639.pdf
    • https://cdn.shopify.com/s/files/1/0438/4374/7990/files/zevowoletibopizawikowuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7419/0498/files/482959915.pdf
    • https://cdn.shopify.com/s/files/1/0432/3452/5347/files/6622691022.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5151/files/51509157832.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2485/files/asia_political_map_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/6685/8408/files/fisavidabu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0414/files/calendario_2020_argentina_para_imprimir_con_feriados.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/rasepezegepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8930/5506/files/5e_rogue_build.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_off00007449.bin
4e0b9992649ff2c285530fb2db29ba66c08659de16e8b14938d766643a557b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7449 5616 bytes
font_01_sfnt_off00008748.bin
8baa053904c95f96391952d28e29faf45bb05b52f9132530d85a608aa7b47f88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8748 10336 bytes

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