Malicious PDF — malware analysis report

Static analysis result for SHA-256 159a677edca1422a…

MALICIOUS

PDF

41.9 KB Created: 2020-08-03 03:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b6c10793fc05e32b7578bfc00acd7cf SHA-1: 5ae129fb0264f6f49f67ef33fd731b28eac3721c SHA-256: 159a677edca1422af93041814963ec739ce53b862e296a07df1267cd26460fef
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=shell+shockers+aimbot+download. Additionally, a heuristic indicated a social-engineering lure to install a browser extension or update, a common tactic for credential theft or malware delivery.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=shell+shockers+aimbot+download
    • http://files.arabesquelondon.com/uploads/1/3/0/7/130775635/tuxefodozewizukatema.pdf
    • http://files.pendeenpottery.co.uk/uploads/1/3/2/6/132681342/labovukajov_vebaxemomewove_gemokofov_binogeba.pdf
    • http://files.myjamesandrews.com/uploads/1/3/2/7/132712661/4258114.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5684/0354/files/utorrent_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6960/files/sears_riding_mower_parts.pdf
    • https://cdn.shopify.com/s/files/1/0438/2746/2301/files/recessive_epistasis_ratio.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83759083977.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5770/files/zupexotavidowudasanu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4682/1278/files/73982430055.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7391/files/15074135258.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1288/files/nisipufale.pdf
    • https://cdn.shopify.com/s/files/1/0431/2783/2733/files/wejuvit.pdf
    • https://cdn.shopify.com/s/files/1/0435/7446/0579/files/xulepipatinuxepimukite.pdf
    • https://cdn.shopify.com/s/files/1/0435/6777/5905/files/xuvegozas.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/pixuworuma.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005875.bin
ac92f6cc8d01594fcfd1a05078b9822f15993199e25ee1d18912140adeb58766		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5875 5364 bytes
font_01_sfnt_off00006a8d.bin
248b27d9f265feb84f1da15dfcc751566fdecd64dda4773c25423421a8368dc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8D 9968 bytes
font_02_sfnt_off00008cbc.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBC 4324 bytes

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