Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb7cb0cb50532e7…

MALICIOUS

PDF

42.0 KB Created: 2020-09-09 10:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 187b3869603f763fc7e6b7975c45472b SHA-1: 5c851d6a170acb7363c7cdc98a7b042121ca2279 SHA-256: 7bb7cb0cb50532e71e87787cc350f6a452b32e9c5d3ba3f3e9f276a6f716d742
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with one specific URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/wix?keyword=bhairava+tamil+movie+theme+songs', suggesting a lure to external content. The presence of numerous links and the ML classifier's high confidence indicate a malicious intent, likely related to SEO spam or phishing.

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.me/wix?keyword=bhairava+tamil+movie+theme+songs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c7ef1a_88eae7fdf741418183f6d8083d58f1f5.pdf
    • https://static.usrfiles.com/ugd/a76634_2cf4e08d7a724ef390b98a03eab72d53.pdf
    • https://static.usrfiles.com/ugd/83b1b3_e301c82b0a9346efa80b2e864a9f8d84.pdf
    • https://static.usrfiles.com/ugd/03dcd4_761d319168d6441b9b791ab7eb765d36.pdf
    • https://static.usrfiles.com/ugd/3d0627_6f62aaa931f443208ec9e7ca5db9df83.pdf
    • https://static.usrfiles.com/ugd/0779a3_89b408a610ea4faca3f17cbbe794499e.pdf
    • https://static.usrfiles.com/ugd/18574e_21629f4f51ee42ffa81a66f59579b8f5.pdf
    • https://static.usrfiles.com/ugd/af0aa9_c02e22481ef648cfadfce4e51ea7e21f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3912266a6694ec7a4038ccb1f1778ca.pdf
    • https://static.usrfiles.com/ugd/20d83a_271ba1b9edea4d2385c6a0ba9c2a8799.pdf
    • https://static.usrfiles.com/ugd/1f2646_bde5208b9702429db0cdabb84dca06f8.pdf
    • https://static.usrfiles.com/ugd/e4a001_37de38d673844be0b26c18aca3af607b.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc4ab14617c14f5c97f5d358f46dbd76.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7626/files/clinical_guide_to_cardiology.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1334/files/ranuvipakatirokosi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3523/8301/files/26184887059.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_off0000650e.bin
65bd9669cf4b44a9da1668d369378aa55010ed2a81b5575cae5ffbe0eb96235b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650E 5208 bytes
font_01_sfnt_off000076a2.bin
5ff38b72967eed7fda665e3be2fdb506809fe4e0a204e1c8fd09d743a9aa82dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A2 10796 bytes

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