Malicious PDF — malware analysis report

Static analysis result for SHA-256 126c837134f30547…

MALICIOUS

PDF

46.2 KB Created: 2020-08-06 08:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd11770c0bc5b96ec92ca90a8cc46854 SHA-1: 9262b61fa8a0ed19ff00d3c40b19df74a31396eb SHA-256: 126c837134f30547700cee86b8723022a284c4bdc4af2b4ec32eec374270c28b
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector pointing to 'https://ttraff.ru/pify?keyword=bengali+cooking+recipes+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users into clicking it. The presence of numerous other PDF links further supports the 'PDF_SEO_LINK_FARM' heuristic, indicating a likely attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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=bengali+cooking+recipes+pdf
    • http://files.popova-fashion.com/uploads/1/3/1/6/131606733/ledurubabo-ramorixid.pdf
    • http://files.winstickers.co.uk/uploads/1/3/2/6/132680931/7660827.pdf
    • http://files.karuewachiraphotography.com/uploads/1/3/1/4/131438216/xewiwolilawetomoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3321/5654/files/dimimoforim.pdf
    • https://cdn.shopify.com/s/files/1/0431/9503/9905/files/75603990138.pdf
    • https://cdn.shopify.com/s/files/1/0437/8414/3010/files/31422915304.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3672/files/cub_scout_wolf_handbook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/7318/4678/files/7633775576.pdf
    • https://cdn.shopify.com/s/files/1/0432/9832/4638/files/fofexufixasufejovitelo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3144/files/23481151459.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7142/files/34136249704.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/degaxipivikopinawaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/6142/5814/files/wow_classic_lionheart_helm.pdf
    • https://cdn.shopify.com/s/files/1/0431/8448/8607/files/gastroenteritis_viral_y_bacteriana.pdf
    • https://cdn.shopify.com/s/files/1/0433/0913/8084/files/23318212673.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_off000076c4.bin
6cbc0f17f1b00fc4bc98176d154b05a1bf778c04878822e5997990b300ac93ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C4 5436 bytes
font_01_sfnt_off00008959.bin
98e8b27545ae0df647982d1d11a0144dd7065ba1977917091cc3bcbcb677af8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8959 10008 bytes

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