Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b1b5b87ec15eeb…

MALICIOUS

PDF

78.0 KB Created: 2020-08-22 04:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2b88ca551866795c11c85c1ddcfbe47 SHA-1: a81d56aba4ca1bc3f129e82cc2f6872129fe525c SHA-256: 05b1b5b87ec15eebf13b62927bd2552b8ebfe0d46efac426c03f342ab6f6e7a1
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=beyonce+albums++free'. The document body, though heavily obfuscated, also contains this URL, indicating its primary purpose is to redirect users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious.

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=beyonce+albums++free
    • http://files.gilfordtownship.com/uploads/1/3/0/9/130969600/6460729.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/5815/0046/files/rpg_games_free_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/4764/9429/files/bioplastic_article.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/87970549059.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8298/files/android_bezier_curve_example.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3084/files/67048928539.pdf
    • https://cdn.shopify.com/s/files/1/0435/3196/0474/files/certificate_of_internship_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/9024/6822/files/best_website_to_download_free_ebooks.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7186/files/ffxiv_log_file.pdf
    • https://cdn.shopify.com/s/files/1/0438/2726/5693/files/dodowatesubezarakekedaja.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_off0000d208.bin
4cb9fe32043e5629e0a9cc5509234de27ba2c4a108898f42136e79a18e4aff5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 5896 bytes
font_01_sfnt_off0000e654.bin
239e489e4de7395dc49841ced8c0034f54ff72ca5ef559b7c23295ccda9cf1aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 5316 bytes
font_02_sfnt_off0000f858.bin
612fc9bbc263129d8e7d009c1966aa4f9e62fbb69dcd4c03f68699088530fbbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 16464 bytes