Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ae34d14aee6cf2…

MALICIOUS

PDF

114.3 KB Created: 2020-09-01 01:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5e6b9d476227766d03aa9e66d14367e SHA-1: 74feceff7fe7f3d3518e86b2995e7ce26a3303f1 SHA-256: d0ae34d14aee6cf2477e1a7e8b9d3e19f6af2a8b444c3ab50bb37bb4bf4798be
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to external content. The presence of numerous external PDF links further supports a link farm or redirection strategy.

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/wix?keyword=english+to+japanese+words+pdf
    • https://cdn.shopify.com/s/files/1/0435/1783/7467/files/nawukibamukojuresivigum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/woziki.pdf
    • https://cdn.shopify.com/s/files/1/0431/6944/8097/files/fiwawajumotikodaxosekipa.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfe1d7760b8645cd8075260c6caec18d.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd8b6f5a2be84ddaa470b7977464cb9f.pdf
    • https://static.usrfiles.com/ugd/98e298_2d6ca6574cd445b49f1884cf4348f727.pdf
    • https://static.usrfiles.com/ugd/b8c837_57efa042f4554f1193e576dc8e467914.pdf
    • https://static.usrfiles.com/ugd/4c76bf_3dd476f81d274e4abe0cf263d239cd7d.pdf
    • https://static.usrfiles.com/ugd/10e3af_dbfb1401a8cc456e85439dcc0aa06888.pdf
    • https://static.usrfiles.com/ugd/63d3ad_72557eb64522471ba0d3e64f84b66336.pdf
    • https://static.usrfiles.com/ugd/cafc24_acc7a53372d840b6bb604f3f43161fe3.pdf
    • https://static.usrfiles.com/ugd/ab059d_ef1d2c52ceee481eb17de3fc884cc475.pdf
    • https://static.usrfiles.com/ugd/2c8d66_1cd4e7a21b704f878cf6dc3fb01bcd72.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_ecf6275457aa4d21ad5314fc1c53cf1a.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ed6.bin
4371c16a1a25369a5ad22c8a326d27a8a036b074ad8dc053de40c0a512c62f95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED6 27780 bytes
font_01_sfnt_off00016190.bin
401306a5877192d6c944802ccec03539c21f92e894c823e67323bb1fdb7cec71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16190 5428 bytes
font_02_sfnt_off00017421.bin
c6a20edfbf47f83764c2aa2fbf749e58aa5da2fad18f1dce29abbb6a8a756f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17421 18896 bytes
font_03_sfnt_off0001abf4.bin
810f3bde3e4afabe726861b34f007f98cc7eb119a45aca19a533dc4c7aa7f608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABF4 4052 bytes

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