Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbfd55daa73556b…

MALICIOUS

PDF

35.3 KB Created: 2020-08-15 23:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95c4f1f68e5b6f8c48c3d36181bb4e86 SHA-1: d97e40024ba0739722402ac3fbac272036575771 SHA-256: edbfd55daa73556bccd1f6a408a821f51961c790b13f81dc92f1fc77f44b845c
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is the primary indicator of malicious intent. The document body, though heavily obfuscated, contains the URL that leads to the redirector. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to attract search engine traffic and potentially distribute malicious content. The primary malicious URL is https://ttraff.cc/wb?keyword=john%20freund%20mathematical%20statistics%20pdf, which redirects to other potentially malicious sites.

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.cc/wb?keyword=john%20freund%20mathematical%20statistics%20pdf
    • http://botejeseg.slant.biz/uploads/1/3/1/3/131383483/8517003.pdf
    • http://files.ubershrimp.com/uploads/1/3/1/3/131379732/paxowuz-waxawit-bulirixudok.pdf
    • http://files.mindfulserenityonline.com/uploads/1/3/2/8/132814375/sugofarisenoli.pdf
    • http://files.catherinehedrich.com/uploads/1/3/1/4/131437699/d0b26051.pdf
    • https://cdn.shopify.com/s/files/1/0434/6334/4280/files/53742027905.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/4921514353.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60359225188.pdf
    • https://cdn.shopify.com/s/files/1/0428/9937/4236/files/buzalavopogaro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0430/1222/7225/files/62866671044.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/bokebidefi.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/on_the_road_again_chords.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/48920472357.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1703/files/64511148291.pdf
    • https://cdn.shopify.com/s/files/1/0440/6244/1622/files/assyrian_english_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0447/9103/8118/files/9133246133.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_off00004bf2.bin
1a6caf19c6af5583f04bc0a78ab954777ae93bfb25d9a3fc2099d4c8020cfd67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF2 5384 bytes
font_01_sfnt_off00005e0f.bin
c6e139834b8da23dec35f28e40e84053717f16f5c20989b9a374afed7da7f4cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0F 10016 bytes

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