Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c884fa52c2bd6d…

MALICIOUS

PDF

41.0 KB Created: 2020-09-01 11:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0593c073370fb4feb982fed66bbee43a SHA-1: 5898d1b6484627b2b5c0a8598a20a0234ec9d21e SHA-256: d8c884fa52c2bd6d9f88b4369a310e90097450f5ea8b8559e90a4d5e11af26ea
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=hsbc+online+assessment+test+answers', which is designed to lure users into clicking it. The document body, though heavily obfuscated, contains text related to 'Hsbc online assessment test answers', suggesting a phishing or scam attempt. The presence of a large number of external PDF links, many pointing to static.usrfiles.com, indicates a link farm designed to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=hsbc+online+assessment+test+answers
    • https://static.usrfiles.com/ugd/cd79e3_d045bc89f46e451ab4edbcbd1c31ef26.pdf
    • https://static.usrfiles.com/ugd/b8c837_842076b0f3044061a91b717af4f3cd86.pdf
    • https://static.usrfiles.com/ugd/b8c837_a670356499dd43e3894f7909b301ef2a.pdf
    • https://static.usrfiles.com/ugd/c7a620_0aa23ef1cf50492eb27eddfcf7109415.pdf
    • https://static.usrfiles.com/ugd/0dd040_32e719591d9749a2a7949cda677fe594.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb642f2e8f87472d92571b067a601cef.pdf
    • https://static.usrfiles.com/ugd/b50c55_18375a9e726b4c16be1c1033af36c1c9.pdf
    • https://static.usrfiles.com/ugd/804ff6_2d75db1768cc44e9bd3cb3cb098beab6.pdf
    • https://static.usrfiles.com/ugd/599f1c_d43b82ba3d0d43abbfea558e4ba92898.pdf
    • https://static.usrfiles.com/ugd/43d598_9cc07ed2bfd849c78774e9ea36408800.pdf
    • https://static.usrfiles.com/ugd/ef7b09_82a15d4686bb4afb93161d60a6e25d6a.pdf
    • https://static.usrfiles.com/ugd/6da380_e9e39d4fb52f4c6ca924840bde6882d4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000620c.bin
b4120ff0576b92dbcf9557fd151216819c2f6cde8a60340babf200090e51ce47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x620C 5140 bytes
font_01_sfnt_off0000737f.bin
574b479d304d0af68515e436f61117d116fd33ff1e796f9aed9817088f44a3c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x737F 10560 bytes

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