Malicious PDF — malware analysis report

Static analysis result for SHA-256 621f839add28bc49…

MALICIOUS

PDF

48.0 KB Created: 2020-09-01 04:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 647291d2f2a91cd1a835fbefae0b25bf SHA-1: c03f3384d78aaf09b72e8126ab2ec343b11d4e0e SHA-256: 621f839add28bc49360a9448a8ee104cc0c20e1fc29d8d8174597a8eff5eff90
190 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.cc. The document body, though heavily obfuscated, contains the URL that was likely used to generate the PDF, suggesting a content-generation tool was used to create a link farm. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=boschveld+chickens+in+zimbabwe+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ea78e0_4961f50ef47e447ea7b53c97e7a518e7.pdf
    • https://static.usrfiles.com/ugd/b0b521_d204c96cf586478e9a95b75e9a8f0c85.pdf
    • https://static.usrfiles.com/ugd/76de1a_5624bb03b45c4c1683224e1b69393cd1.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/71560985756.pdf
    • https://cdn.shopify.com/s/files/1/0454/1834/8712/files/pigifowidowiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/project_governance_template_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/35999446167.pdf
    • https://cdn.shopify.com/s/files/1/0433/7539/4977/files/3044064539.pdf
    • https://cdn.shopify.com/s/files/1/0437/1061/1605/files/38109740804.pdf
    • https://cdn.shopify.com/s/files/1/0430/2068/1377/files/xejusuzakagefagomelux.pdf
    • https://cdn.shopify.com/s/files/1/0428/4694/5436/files/tobunirutij.pdf
    • https://cdn.shopify.com/s/files/1/0439/2812/5595/files/63397689135.pdf
    • https://cdn.shopify.com/s/files/1/0429/2942/2499/files/rasuxupitat.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e8723e5c2844bbfaa6b46d80c58e448.pdf
    • https://static.usrfiles.com/ugd/50de67_57fa78d8ec82412ca7c960691ea5468a.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_off00007a88.bin
343bc3305cedda27dec161fb0fc05b774a62caf583c558c76eb62cadfe3fde3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A88 5756 bytes
font_01_sfnt_off00008e1a.bin
6bed3e14de1cb80b8707e06e7508ec12149b720ff818cbe1c4d354e5f8886809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E1A 10680 bytes

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