Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d84512d025b255…

MALICIOUS

PDF

42.7 KB Created: 2020-08-30 07:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 699f56607c91df716b369a2a04d0f609 SHA-1: 5c5d5a52e06be324e2b275ae379a9c737ad4a41e SHA-256: 16d84512d025b255982bff3f46e3203580c0963bfd67a19e67306d945564d84f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and heuristics indicate it contains a link farm pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same suspicious URL. This suggests the document is designed to lure users to malicious websites, likely for phishing or malware distribution.

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.com/wix?keyword=air+force+climate+control+oil+filled
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5709/4559/files/savage_in_limbo_monologue.pdf
    • https://cdn.shopify.com/s/files/1/0429/2358/9788/files/tugatawedolafarumipirom.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/hcc_tsi_testing.pdf
    • https://static.usrfiles.com/ugd/c0fca2_ccb978183b26490d8226963947367892.pdf
    • https://static.usrfiles.com/ugd/e73fea_03fac4a317d14d89bec8349b28a8bbdb.pdf
    • https://static.usrfiles.com/ugd/8d57bd_3adf3cf2759e48c5a16fa964da6cc935.pdf
    • https://static.usrfiles.com/ugd/d55797_3dade70e57dc42c786de2e0bec0c6de9.pdf
    • https://cdn.shopify.com/s/files/1/0447/2075/0745/files/cambridge_history_byzantine_empire.pdf
    • https://cdn.shopify.com/s/files/1/0437/4108/5845/files/fishing_report_rice_lake_wi.pdf
    • https://static.usrfiles.com/ugd/3f80ec_260906f6a45349e790527f090e07e8cc.pdf
    • https://static.usrfiles.com/ugd/a64c8c_8d4ab0f6475e450db72a494fc8696fc2.pdf
    • https://static.usrfiles.com/ugd/4b874d_c1752e8adf2a4ef484cd73d527c00f00.pdf
    • https://static.usrfiles.com/ugd/b8c837_aed81ba7b08a47d29e8023889db43d12.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b6e3b6021034155861f02ebd27a7b7e.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_off0000665b.bin
acb37ec49ff525e428b02cdb58a5915d3ce0f03155840d48b12e94fb3f07b987
pdf-font-stream PDF embedded font (sfnt) at offset 0x665B 4976 bytes
font_01_sfnt_off00007724.bin
ae217653a18cae8bf3e2efef79886c6e42af2c4c46eafaaa0e40af0890542ce8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7724 11828 bytes