Malicious PDF — malware analysis report

Static analysis result for SHA-256 719728c3cf6c4b00…

MALICIOUS

PDF

46.4 KB Created: 2020-07-30 11:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3dfbb707d21320c83fc4fe2d32f232cf SHA-1: 5195635f541e73b990592f76bc8045685c622a73 SHA-256: 719728c3cf6c4b00ff278054131351a1f529260524c09c36ad8750181b6011ee
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a link farm designed to generate traffic and potentially lead users to malicious sites. One prominent URL, 'https://ttraff.ru/pify?keyword=appointment+with+death+pdf+free+download', is identified as a malicious redirector. The document body, though heavily obfuscated, contains keywords related to downloading a PDF, suggesting a lure for users seeking content. The ML classifier also strongly indicated maliciousness.

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=appointment+with+death+pdf+free+download
    • http://files.tutuperformingarts.com/uploads/1/3/2/6/132681969/gomis.pdf
    • http://files.opsi-lift.com/uploads/1/3/0/7/130775850/9509377a10c.pdf
    • http://files.lpcomch.com/uploads/1/3/1/0/131071137/melubivatumu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0756/5209/files/27596520258.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tekutuni.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1702/files/57713407103.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/mojalodenufokatipalorigis.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/xisubumisonedemetapipaje.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73792904944.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/tapumamamukezob.pdf
    • https://cdn.shopify.com/s/files/1/0435/3572/8794/files/62789262047.pdf
    • https://cdn.shopify.com/s/files/1/0440/8875/4328/files/ribakev.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9762/files/10505444398.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/16471429542.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/40181741784.pdf
    • https://cdn.shopify.com/s/files/1/0429/5557/1353/files/kozukipi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1669/files/tukam.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_off00006e92.bin
92594b34af255b216199688a02aa37129a8528bd03e6fe613a64f2c3ca6bc747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E92 4972 bytes
font_01_sfnt_off00007f42.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F42 1800 bytes
font_02_sfnt_off000087d0.bin
c8fe8b3bb7aaf758dc502739bf147c36a5b9f61e5e107177e944840190d1cc7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87D0 10472 bytes

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