Malicious PDF — malware analysis report

Static analysis result for SHA-256 85af9f3760647c50…

MALICIOUS

PDF

44.4 KB Created: 2020-08-19 18:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9493990a7475da6daa418d381d2596c7 SHA-1: 391686f6fd8c7d5cf74c29773e2ece362c591d07 SHA-256: 85af9f3760647c50820caf2aa069eb32c72424e82375be4c5acb4fbe33c28804
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external resources, forming a link farm. One prominent link, 'https://ttraff.ru/pify?keyword=chakra+healing+sleep+guided+meditation', is identified as a malicious redirector. The document body, though partially corrupted, also contains this URL, suggesting an attempt to trick users into clicking it. 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=chakra+healing+sleep+guided+meditation
    • http://files.victoryframe.com/uploads/1/3/0/8/130873851/5825974.pdf
    • http://misefiz.cambridgeintlschool.com/uploads/1/3/1/3/131383541/bced432f6.pdf
    • http://files.licmotorsports.com/uploads/1/3/0/9/130969452/414201.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/19389742857.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/magokegug.pdf
    • https://cdn.shopify.com/s/files/1/0436/7053/6345/files/xetilikijilako.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/66082961211.pdf
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/nekaxefugafosibijes.pdf
    • https://cdn.shopify.com/s/files/1/0433/9145/1294/files/79547595546.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4389/files/free_technical_drawing_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/3979/3050/files/saxusativi.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_off00006f49.bin
2ac8cc5ba23d19b6c8a09747a217f2fc803ed91c72098f868bbc944d6c173df8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F49 5340 bytes
font_01_sfnt_off00008144.bin
fd6351d94c3a9b482e99541b57f6c59d9aa3dd8bd7ffbe924947e240805b2a70
pdf-font-stream PDF embedded font (sfnt) at offset 0x8144 10496 bytes