Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d19c2e9ec815b5…

MALICIOUS

PDF

43.0 KB Created: 2020-08-10 20:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81e509c5b612035080acd19fe3bd403a SHA-1: 74a62b06ac4a9154888a7c05d019a9865bffea29 SHA-256: 61d19c2e9ec815b55761ab8882ba3b2c4c261177161116789df281b379a17139
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains text suggesting a lure for academic papers, and the presence of multiple external links indicates an attempt to drive traffic to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bitsat+2020+paper+pdf+download
    • http://files.lindamcbrideart.com/uploads/1/3/1/0/131070149/xuxozavifite-xaselujagetago-wakudavukemak-vepeko.pdf
    • http://jonodu.stronghabitsforlife.com/uploads/1/3/1/4/131407263/fuwofejiluniw-luladaz-kagetoj.pdf
    • http://files.safna.com/uploads/1/3/0/7/130739028/xajat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8907/5102/files/99039785941.pdf
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/historia_de_las_barras_bravas_en_colombia.pdf
    • https://cdn.shopify.com/s/files/1/0428/8852/8035/files/bgp_configuration_example.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/certificacion_leed_requisitos.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/36481823528.pdf
    • https://cdn.shopify.com/s/files/1/0432/3426/3199/files/15902281698.pdf
    • https://cdn.shopify.com/s/files/1/0433/3476/2654/files/quant_job_interview_questions_and_answers_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5321/2060/files/50418790054.pdf
    • https://cdn.shopify.com/s/files/1/0429/4223/4791/files/pawirajasinif.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9561/files/82416483130.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/88105008340.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_off000069aa.bin
6545aba03adb7e4624bc94717e945b04bfae527df647aee89447ef3ece51b635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69AA 5452 bytes
font_01_sfnt_off00007c53.bin
552d4e9ad5e02b7b0bbd45e2844954394486aac16742e6e556c6285d4c76a247		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C53 10196 bytes

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