Malicious PDF — malware analysis report

Static analysis result for SHA-256 173ac6c7f5d71cb9…

MALICIOUS

PDF

39.8 KB Created: 2020-08-08 21:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a898c5115bd2dc15d1811d9f9427a5eb SHA-1: 77469bdf7552a25a858a80a9b584da5db5664652 SHA-256: 173ac6c7f5d71cb930efabe84b123dd79129ce64cec1df3b38e5653249a478ad
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=form+amalgamasi+pdf'. The document body, though heavily obfuscated, also contains this URL and numerous other links pointing to Shopify-hosted PDFs, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to malicious content.

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.cc/pify?keyword=form+amalgamasi+pdf
    • http://files.milwaukeedowntownchiropractic.com/uploads/1/3/0/7/130739895/90984fdad05008e.pdf
    • http://files.noemiddleschool.net/uploads/1/3/1/4/131406780/9504701.pdf
    • http://jinozep.lifestylelanguageschool.com/uploads/1/3/1/3/131398560/7467466.pdf
    • http://files.mountshannonarts.net/uploads/1/3/1/6/131637850/931650.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vukabisozudetilo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/12115537382.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7429/files/67126590540.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6604/files/52544374747.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8743/files/darugawefujo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wunize.pdf
    • https://cdn.shopify.com/s/files/1/0433/3735/1326/files/mezuroxupuxobadajuvukosa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/69691492418.pdf
    • https://cdn.shopify.com/s/files/1/0434/3100/2264/files/conduction_system_of_heart.pdf
    • https://cdn.shopify.com/s/files/1/0429/0497/7564/files/sarowazubari.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/26140679966.pdf
    • https://cdn.shopify.com/s/files/1/0438/1350/3133/files/jaxuzuxisegi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/nazetexofedozomabejibite.pdf
    • https://cdn.shopify.com/s/files/1/0435/6338/4991/files/college_physics_10th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/70951825841.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_off00005cea.bin
952c5bc10a5e9d2f2430f1b65bfa7d98147a287ca5e98f1f2242db34222f7c5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CEA 5316 bytes
font_01_sfnt_off00006ee7.bin
864427ee4e4d9c6d57404bd183641d70b4b8ce8b6241bd5bd3b8db4f7f874976		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE7 10352 bytes

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