Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd3ec9fa5fa8173…

MALICIOUS

PDF

42.2 KB Created: 2020-08-13 03:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09be404b3fba4437f658cf298b2b7430 SHA-1: ac6f7ded39cf934a5cdeb65341e1e782f1396b5c SHA-256: fdd3ec9fa5fa8173f37e5d01c30324166891111876a0ef127c89726cc3c11ea0
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains numerous embedded links, including a critical finding of a malicious redirector link to ttraff.ru. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results. The document body, though partially corrupted, contains text related to 'Problemas de salud mental en mexico pdf' and references wkhtmltopdf, indicating it's likely a lure document designed to drive traffic to malicious infrastructure.

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=problemas%20de%20salud%20mental%20en%20mexico%20pdf
    • http://legilubup.scatteredsacred.com/uploads/1/3/1/1/131164239/2367133.pdf
    • http://files.pkkgallery.com/uploads/1/3/1/3/131379828/pelitejefarasozu.pdf
    • http://files.danielemonico.com/uploads/1/3/2/6/132681969/gadulevetojunijeva.pdf
    • http://files.acorncottagestudio.com/uploads/1/3/1/4/131413678/jufixekoke-bovisubizirojo.pdf
    • http://files.antengineering.com.au/uploads/1/3/1/4/131437584/a51227c70cf.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/94112678599.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/big_data_analytics_wiley_publications.pdf
    • https://cdn.shopify.com/s/files/1/0433/8355/4202/files/baixar_reader_foxit.pdf
    • https://cdn.shopify.com/s/files/1/0435/4804/9572/files/album_jet_primera_edicion_1967.pdf
    • https://cdn.shopify.com/s/files/1/0434/2962/6017/files/13704605502.pdf
    • https://cdn.shopify.com/s/files/1/0439/0780/9448/files/xulotupemibepunelidebura.pdf
    • https://cdn.shopify.com/s/files/1/0435/7505/0395/files/16986774099.pdf
    • https://cdn.shopify.com/s/files/1/0433/9580/9431/files/sojirulorutopukelekale.pdf
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/xataxozagajududegemopa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5306/3063/files/zivujibavonepagodoxamek.pdf
    • https://cdn.shopify.com/s/files/1/0434/5298/9605/files/24536159502.pdf
    • https://cdn.shopify.com/s/files/1/0438/1281/5008/files/20486663306.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_off00006237.bin
7c778eea5e4fb0e9a21cdc518b42f99aa2ab2bbb6ffbc85a6342c04f370f5036		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6237 5508 bytes
font_01_sfnt_off000074d4.bin
3c207317a14cf2ceec6041a5a2f368757c6b852710e9495c7340626d96c5ea49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D4 11508 bytes

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