Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a53c0e43d93b5e…

MALICIOUS

PDF

40.5 KB Created: 2020-08-03 11:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b3116d43ee8501f6c9eda84b024721b SHA-1: 0d29e6425e6ed244167f5a8383be0d37c6e05e1e SHA-256: f2a53c0e43d93b5eb05d734f052dda4cc6478c2b7a5b44da436407c156390ea2
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=acute+pulmonary+edema+pdf+nejm', which is likely intended to trick the user into clicking through to a malicious site. The presence of numerous Shopify-hosted PDF links suggests a link farm or SEO poisoning tactic to obscure the malicious redirector.

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.cc/pify?keyword=acute+pulmonary+edema+pdf+nejm
    • http://files.ptnawaperkasa.com/uploads/1/3/0/7/130775903/xononixeruweruxenej.pdf
    • http://files.infinityhorsemanship.com/uploads/1/3/0/7/130739311/6079189.pdf
    • http://files.earsforyears.org/uploads/1/3/2/8/132815365/5178547.pdf
    • http://files.saxophonistforhire.co.uk/uploads/1/3/1/4/131453260/6fc49f6d6a4.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/29797895106.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8550/files/fipanamofusixenora.pdf
    • https://cdn.shopify.com/s/files/1/0436/6349/1222/files/59934315131.pdf
    • https://cdn.shopify.com/s/files/1/0434/4945/0661/files/juvolavebarumipan.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6729/files/3063276919.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/kavuvitafakevelanat.pdf
    • https://cdn.shopify.com/s/files/1/0431/2511/2994/files/code_geass_op_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/3759/7607/files/55705934535.pdf
    • https://cdn.shopify.com/s/files/1/0433/9580/9431/files/health_and_wellness_gordon_edlin.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9292/files/15168169383.pdf
    • https://cdn.shopify.com/s/files/1/0433/7981/8661/files/55837603316.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6096/files/tugalixi.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_off00005f92.bin
08db2aea411609637f23635f8c5490bf99758c88687e9e5115a513bfade9a8ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F92 5292 bytes
font_01_sfnt_off0000718c.bin
78e11ea82d8dbf082b6177ad2448808262077ec345fc110e4d68004b91bb5abb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x718C 10604 bytes

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