Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f94272f1823feb…

MALICIOUS

PDF

43.8 KB Created: 2020-09-07 13:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77516e14b24b8c729a2882fe5c34795c SHA-1: 33eaf52cbc47be74c6e320a2bba4c3486a708267 SHA-256: 03f94272f1823feb1c95b087dcbc49eca271e40075ed99f3436a9b4ecffd656e
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a PDF redirector link pointing to a malicious URL. The document body, though heavily obfuscated, contains references to 'hotstar app free for pc' and a URL that appears to be part of a link farm. The presence of a 'SE_LOLBIN_RUN_COMMAND' heuristic suggests potential execution of commands, possibly via embedded JavaScript, which is common for PDF-based malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=hotstar+app+free++for+pc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d43733_4acfffca5f724c338b066817be008dae.pdf
    • https://static.usrfiles.com/ugd/a421e3_4a9e403ad1e04e43a7f352c7f0b702bf.pdf
    • https://static.usrfiles.com/ugd/b97cba_936dd5f700a7485e8666f30ed8b7c3e3.pdf
    • https://static.usrfiles.com/ugd/9dda13_9e2c8515c5e14d55be889caa89f1eaf1.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3815/files/41392021421.pdf
    • https://static.usrfiles.com/ugd/a4c1fa_3350a42aab984d048eea23d069f96551.pdf
    • https://static.usrfiles.com/ugd/418e76_d17b2967015246e9bc656386996a5ca8.pdf
    • https://static.usrfiles.com/ugd/0bcf16_e1848c6773584fb3980fe9a58e0d7b42.pdf
    • https://static.usrfiles.com/ugd/5438e3_82251ad331f341f3a368d086a55ede94.pdf
    • https://static.usrfiles.com/ugd/70094d_24dda47a3b8547359e4084231fefbf8c.pdf
    • https://static.usrfiles.com/ugd/daca0d_4dfaca13ab6a4c60aabfbc20ea4c44af.pdf
    • https://static.usrfiles.com/ugd/3e7897_c75eea2902af445b98b62c422aa248ae.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_off00006edb.bin
1537f55d3a4ba21c879e1e7910b900e9755083da11cc7acd4e6eaa37ba349b7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDB 4940 bytes
font_01_sfnt_off00007fb4.bin
f6c8f6e79878776592f3892f831c5f541f3f07d3bfe6db2516afcf5e25a7e991		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB4 10316 bytes

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