Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4ad7199056b137…

MALICIOUS

PDF

42.0 KB Created: 2020-08-31 21:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74aa67136741e5fa50234a977c6e179c SHA-1: 87a9b34116fc5be4fe217eb7ebba0022dbb0883f SHA-256: 6b4ad7199056b137fcb4a1c67999234d25eb70b785e7ac73feeb6baf9e59fbc8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious objective. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other benign-looking PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=mario+cappy+eyes+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7786/8443/files/64836867346.pdf
    • https://cdn.shopify.com/s/files/1/0441/0910/3256/files/57241969016.pdf
    • https://cdn.shopify.com/s/files/1/0431/8078/5823/files/needle_stick_injury_incident_report_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/2567/0042/files/nagasadilepokonibepedasav.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0805/files/jusugovofovariwusodosizo.pdf
    • https://static.usrfiles.com/ugd/fa32a6_3d2511433906495ea496107e6b084861.pdf
    • https://static.usrfiles.com/ugd/b8c837_e90bf73675f04c30b8fc7ed03ca40738.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd8539a7c5b848be8d4ab155ebe52973.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/sikaxadeketumetekunum.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6566/files/votiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0525/5577/files/sakuvujodipe.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/gufotuwunusu.pdf
    • https://cdn.shopify.com/s/files/1/0436/8164/4697/files/israel_houghton_i_surrender_all.pdf
    • https://static.usrfiles.com/ugd/b8c837_82ffa41a2f0a4ea58ef08650f38e5c37.pdf
    • https://static.usrfiles.com/ugd/b8c837_60aefdf27c8640259bb89050a311a25f.pdf
    • https://static.usrfiles.com/ugd/99965f_17854ac6209347b7ac974267ac5bf2da.pdf
    • https://static.usrfiles.com/ugd/8cbfce_3ad7f5f44c4a4f2581286a8a58c5a13e.pdf
    • https://static.usrfiles.com/ugd/07e02c_85aa5ba61560401aab88d0df2993d354.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064fc.bin
013247503634d5d1513ee68fbb91866c56a85597855e7be2efc9381eef83126f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FC 5188 bytes
font_01_sfnt_off0000769e.bin
7bc1260b10f27dac1c1ee2dc8816b58b9d48ff47cac7317deef6c37e6cc25647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769E 10540 bytes

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