Malicious PDF — malware analysis report

Static analysis result for SHA-256 611348c1d8923fc9…

MALICIOUS

PDF

59.9 KB Created: 2020-08-29 14:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 596f6e0d058552e74bffee8f5c12db48 SHA-1: f0103bcb7085532ca19e08bc2625b58662ca0ff6 SHA-256: 611348c1d8923fc939465ca5fe47023ec6c8af8909c1372166c5945badabd829
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector at 'https://ttraff.ru/wix?keyword=presentation+skills+ppt+free'. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. The document body, though heavily obfuscated, contains references to presentation skills and URLs, reinforcing the lure.

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/wix?keyword=presentation+skills+ppt+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1828/7266/files/36826876403.pdf
    • https://cdn.shopify.com/s/files/1/0436/1181/6099/files/enlace_metalico_ejercicios_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/janupotejuromimoza.pdf
    • https://cdn.shopify.com/s/files/1/0434/9794/7288/files/37678238994.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/rukubujopimozubajef.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/social_and_personality_development_an_advanced_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/lexipuxow.pdf
    • https://cdn.shopify.com/s/files/1/0433/9607/1589/files/rubezuze.pdf
    • https://cdn.shopify.com/s/files/1/0437/0815/4008/files/pibegexikadeparojazu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6994/7555/files/jenaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/decision_support_and_business_intelligence_systems_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/calculator_for_win_10.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/liwaragenarowaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2310/5189/files/70340010619.pdf
    • https://cdn.shopify.com/s/files/1/0432/3105/1931/files/45382515319.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_off0000aec4.bin
5d6a595080674c8bafb20fc9e69267fe9d03d5caf88345f615528b144f3899ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC4 4960 bytes
font_01_sfnt_off0000bfac.bin
138b5b36bbb4149a899b7d045d55cd69b45a7da4fff8d4c31fd7c114f762ca51
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAC 10356 bytes