Malicious PDF — malware analysis report

Static analysis result for SHA-256 c093e4b945302fce…

MALICIOUS

PDF

48.3 KB Created: 2020-09-01 05:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3de6b336d926536fac398d4723d8c6d4 SHA-1: de3fca640736bc14e29c9c94bdb20f6d832d4b2c SHA-256: c093e4b945302fceec522c5796f6fea8cfab7c9df9304a0a95a46681fd1c13f4
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=capital+gains+tax+computation+worksheet'. The document body, though heavily obfuscated, appears to contain references to tax computation and includes the same malicious URL. The file also exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, likely for SEO poisoning or to obscure the primary malicious destination.

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=capital+gains+tax+computation+worksheet
    • https://static.usrfiles.com/ugd/5e8de6_abe61fb969734b2bad7b2fa9eea7fd78.pdf
    • https://static.usrfiles.com/ugd/e2c250_7b265c0d78fc4b51aef6549b31c4190b.pdf
    • https://static.usrfiles.com/ugd/defcb2_9f65d831988241288233b65ab4f7f8c2.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0676/files/83440459303.pdf
    • https://cdn.shopify.com/s/files/1/0435/9671/0047/files/i_am_aldolpho_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/1773/8152/files/pipadegepixavunukukux.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4900/files/mogesuzekulixa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3609/files/misplaced_modifiers_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/6228/8793/files/57448552445.pdf
    • https://cdn.shopify.com/s/files/1/0431/5332/6241/files/25902361128.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/35870578765.pdf
    • https://cdn.shopify.com/s/files/1/0432/0614/8255/files/behaviorist_theory_of_second_language_acquisition.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6228/files/38853988624.pdf
    • https://cdn.shopify.com/s/files/1/0433/4216/8218/files/notivunuzigafi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8522/5372/files/80554366298.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_off00007cab.bin
56d19b0b5c6d7895ea3108cdc43bce1336db16310aa77506aa647300aa4329f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAB 5476 bytes
font_01_sfnt_off00008f33.bin
26002e18d020507be6c4993f926cfc711adbc4fb6a172aff4185e063a2f54c97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F33 10944 bytes

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