Malicious PDF — malware analysis report

Static analysis result for SHA-256 de643d5afdb6e393…

MALICIOUS

PDF

36.0 KB Created: 2020-08-31 21:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1d24f56fac3d1f82397010ee9068be5 SHA-1: 3cd6b831d9e921891d2141e23432feca7245e204 SHA-256: de643d5afdb6e39399b4c4fd54b373e31957705f406b108648101e050612ade0
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to educational content ('table of contents worksheets for 1st grade'). The presence of a malicious redirector link indicates an attempt to lead the user to a harmful destination, likely for further exploitation or credential harvesting. The ML classifier also strongly flagged this PDF as malicious.

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=table+of+contents+worksheets+for+1st+grade
    • https://static.usrfiles.com/ugd/63022f_832b733e21db493aa8b540a9a523d133.pdf
    • https://static.usrfiles.com/ugd/48d9a1_b165d7a3470c4a67b222dc736cea2f12.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b9c16764ee34b8889832748f31e2e5e.pdf
    • https://static.usrfiles.com/ugd/74e905_734bfe08e6f240a3ad3ebad633a3217f.pdf
    • https://static.usrfiles.com/ugd/b8c837_57315f2387064f5b9116b351a20719dc.pdf
    • https://static.usrfiles.com/ugd/895bef_b1601ddb9be243378546e02cf206774c.pdf
    • https://static.usrfiles.com/ugd/9b5f63_aca68ab62fa948458ff8fb09eda62b2a.pdf
    • https://static.usrfiles.com/ugd/47b1e8_d8c229e31902478c8e98af7348933361.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/47154683202.pdf
    • https://cdn.shopify.com/s/files/1/0439/8697/6926/files/71531894973.pdf
    • https://cdn.shopify.com/s/files/1/0438/9991/2344/files/arenas_movedizas_libro.pdf
    • https://cdn.shopify.com/s/files/1/0437/4937/6161/files/26132512401.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/black_and_decker_18v_weed_eater.pdf
    • https://cdn.shopify.com/s/files/1/0439/0325/4683/files/char-_broil_performance_seriestm_220b.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8894/files/sakoxuziwixox.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_off00004e23.bin
2e8c483bb7abfe940c74b6af59db0b1f59e77700f0afa3f871f9ed9a7268b629		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E23 5580 bytes
font_01_sfnt_off0000612c.bin
50e01983accf12fc7ce2b21b6f376f1e8a5261991ebe179c78b7ac4bcb6a1711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612C 9932 bytes

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