Malicious PDF — malware analysis report

Static analysis result for SHA-256 823734c2291e81e4…

MALICIOUS

PDF

42.6 KB Created: 2020-08-14 21:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99ca127df8453059ea5236fe4c55a88a SHA-1: 8d5afcb0a2e46977d134b683d64bde0a7ae1d8a1 SHA-256: 823734c2291e81e4a97963c34b3d873af868ecc97070546ec84115f9538ca91a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm of numerous PDF files, many hosted on Shopify, and a critical heuristic firing indicates it links to known malicious redirector infrastructure. The primary malicious URL is 'https://ttraff.cc/pify?keyword=define+matrix+of+linear+transformation', which likely serves as a lure to a malicious site. The document body itself is heavily obfuscated but contains references to the malicious URL and benign-looking PDF links.

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=define+matrix+of+linear+transformation
    • http://givop.ciwoa.org/uploads/1/3/0/8/130813834/wowuwilo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/axiomatic_design_nam_suh.pdf
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/lonely_lovers_line_dance.pdf
    • https://cdn.shopify.com/s/files/1/0433/6553/1806/files/jevesopuganizolijogowiviv.pdf
    • https://cdn.shopify.com/s/files/1/0435/3956/2651/files/94303818519.pdf
    • https://cdn.shopify.com/s/files/1/0434/1773/1229/files/syntax_tree_in_compiler_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/2599421324.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/basics_of_affine_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0439/0499/1400/files/degrees_of_adjectives_worksheets_for_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/cambridge_igcse_business_studies_fourth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34993807018.pdf
    • https://cdn.shopify.com/s/files/1/0432/2351/5294/files/antiarritmicos_clase_1.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_off000069e5.bin
996637a6f12525475d74f0edc202a79dcd9ee7a2ac24b90d6981b123c9759956
pdf-font-stream PDF embedded font (sfnt) at offset 0x69E5 4980 bytes
font_01_sfnt_off00007ac3.bin
e35df2eb0f3cb00adf41fce4b0cb371afbb1984d1fe71244e720f930aa4fcecc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC3 10168 bytes