Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a153b5e0621353…

MALICIOUS

PDF

34.2 KB Created: 2020-09-02 00:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 829f1f7f81feadf2ccd1c737b3ed6842 SHA-1: ab83cd6f30b0a6ae8e0511f4131baa26360d8345 SHA-256: a7a153b5e06213539e3ccab39191a8c0d578be6629c5532d149d823271b27db1
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=addition+of+mixed+number+fractions+worksheets'. Another critical heuristic identified a PDF link farm, suggesting a tactic to artificially inflate search engine rankings or distribute malicious content. The document body, though partially corrupted, contains text related to educational worksheets, likely serving as a lure to encourage users to click the malicious link.

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.ru/wix?keyword=addition+of+mixed+number+fractions+worksheets
    • https://static.usrfiles.com/ugd/b8c837_16e7d89d06c64bd5ab6d66e6ba37cc17.pdf
    • https://static.usrfiles.com/ugd/04e6f9_b7dd271579f84477b1b264a60b469e4b.pdf
    • https://static.usrfiles.com/ugd/18f527_788f216841304255b735f2af488661db.pdf
    • https://static.usrfiles.com/ugd/70a38d_d19a48d596924b1da22ae7fdc69b90e5.pdf
    • https://static.usrfiles.com/ugd/46429b_aa0645e6f2c14d018fbc9ee1e8ba9aa2.pdf
    • https://static.usrfiles.com/ugd/63d3ad_25121a77f7884574937e3e8168f93cd4.pdf
    • https://static.usrfiles.com/ugd/804ff6_664fa7e81ae64b15bf25b2771e2700cb.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_efeba21ded0d45ffbfcbe20f40841c5c.pdf
    • https://cdn.shopify.com/s/files/1/0429/3731/9590/files/93367034497.pdf
    • https://cdn.shopify.com/s/files/1/0432/8072/8224/files/melanojifuvajevijozo.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_off0000480c.bin
158f1c1738575424788a7e39f5d70c8b6d8e6d4847af8f09b4ef17c2d5479598		 pdf-font-stream PDF embedded font (sfnt) at offset 0x480C 5584 bytes
font_01_sfnt_off00005af1.bin
a7929f48e69eecaedaf54161943e7a7bfc8beb11b8513bb37053fe1d8dbe40b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF1 9760 bytes

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