Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad2cd7ca76420c3…

MALICIOUS

PDF

37.0 KB Created: 2020-08-31 16:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3490fd1430654aa6805596d11b869d32 SHA-1: 39d6c56513c3bd60ddf4031d4a7c03678b3f9aa5 SHA-256: fad2cd7ca76420c36d847549a43bcdc620f51cd37cfe8a80a6064fb99653f8a8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the primary malicious URL. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, including a high number of Shopify-hosted PDFs.

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/pify?keyword=detail+filter+in+cognos+report+studio
    • https://cdn.shopify.com/s/files/1/0428/1945/3095/files/skyrim_vampire_armor_mod.pdf
    • https://cdn.shopify.com/s/files/1/0427/4687/1974/files/tatedivogoxaropi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3269/1367/files/chevron_phillips_chemical_company_annual_report_2016.pdf
    • https://cdn.shopify.com/s/files/1/0445/2201/2831/files/jupupozusenipetup.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0924/files/vedic_palmistry.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2391/files/sexedexakizabawa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3183/0421/files/list_of_ios_devices.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/69308560623.pdf
    • https://cdn.shopify.com/s/files/1/0465/0772/0854/files/ligojumetimulolunawazak.pdf
    • https://static.usrfiles.com/ugd/0a593f_a682835e854f4f4585ce4bdadcdbc39e.pdf
    • https://static.usrfiles.com/ugd/aff7ca_bb6ba34c73c3481986f0481aa26cb8d3.pdf
    • https://static.usrfiles.com/ugd/5ed537_f2307db817e74ea8bcfa9f9657a2b2f3.pdf
    • https://static.usrfiles.com/ugd/ac51ce_7d8b063ba0d441acbd3bd5a33c42bf75.pdf
    • https://static.usrfiles.com/ugd/105a8c_77cce0d637b64697a0be0f2cbdf3dea6.pdf
    • https://static.usrfiles.com/ugd/8b4172_b0ebeb1125e94984a4fc11df1a1226b1.pdf
    • https://static.usrfiles.com/ugd/9c0842_24f6d53fbc62469d8984fe968f7122cb.pdf
    • https://static.usrfiles.com/ugd/d3758e_ff6baa76fd42489f89c1b7d73b560427.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_off000052dd.bin
824137fd50fc086c452e8ba9df6f1d6bfcbebaea01dfb59d132bb1c7d74d5b8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52DD 5320 bytes
font_01_sfnt_off0000650d.bin
878720b5add6858fb5e65305450dff08418ad55bac3fcd4f6dfc8834f391ce5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650D 9996 bytes

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