Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a69fd9aa977622…

MALICIOUS

PDF

50.2 KB Created: 2020-09-17 17:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a53181278a185cc8b7621491358921ab SHA-1: 40bbbe7211a7369fd6ddab3006927b2042d6d6dc SHA-256: 55a69fd9aa977622d6fa036a50f9cd0c227ab7b4721ef73bf154bd7dddd30fe4
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic indicating it contains a link to a known malicious redirector. The document body contains multiple embedded URLs, including the primary malicious redirector and several other PDF links, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. The primary intent appears to be directing the user to a malicious site via the ttraff.me URL.

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.me/wix?keyword=theories+of+emotion+worksheet
    • http://files.bogardart.com/uploads/1/3/1/4/131437530/dozidekosiwusis_zudaluv.pdf
    • http://nenopipu.marinanatalijewelry.com/uploads/1/3/2/7/132712572/pimabupijajenaj.pdf
    • http://soburaja.jodynixmusic.com/uploads/1/3/0/8/130814995/8857830.pdf
    • https://cdn.shopify.com/s/files/1/0460/3392/8356/files/10359450415.pdf
    • https://cdn.shopify.com/s/files/1/0431/3645/0717/files/nw_zadie_smith.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0429/3384/6172/files/97516314639.pdf
    • https://cdn.shopify.com/s/files/1/0429/4246/4166/files/maravilloso_desastre.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/bab_iv_akreditasi_puskesmas.pdf
    • https://cdn.shopify.com/s/files/1/0435/9503/8888/files/the_classical_theory_of_inflation_illustrates_the_relationship_among.pdf
    • https://cdn.shopify.com/s/files/1/0429/6146/9596/files/58249866187.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/konurixu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2080/4511/files/74054701233.pdf
    • https://cdn.shopify.com/s/files/1/0463/2025/5138/files/jafobud.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_off0000883f.bin
281d83b700b0ba5b3f624011fa393ef9181d394da2b8ea189dca1cfc599418ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x883F 4868 bytes
font_01_sfnt_off000098b7.bin
c0aba32d37b0bd658ceb588192c1550e7c8da46900c1be8ea16f005c57a5d321		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98B7 10412 bytes

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