Malicious PDF — malware analysis report

Static analysis result for SHA-256 6109fbfdc04b0d09…

MALICIOUS

PDF

57.6 KB Created: 2020-08-24 00:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d0a063e11869c0a7cf5762bfa6ba843 SHA-1: 7489d393b99264bcddf64260540b0e757a0f57fd SHA-256: 6109fbfdc04b0d09ab8f97e09581a781e7ed026d364c001cf7aad51c0e3b9c12
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to 'attestation form instructions', suggesting a lure. The presence of numerous external PDF links further indicates a link farm or redirection scheme designed to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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=upsc+attestation+form+instructions
    • http://files.tracygardnerbeno.com/uploads/1/3/0/7/130775808/998790c7ce82.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/26898479335.pdf
    • https://cdn.shopify.com/s/files/1/0432/9409/7576/files/39075693453.pdf
    • https://cdn.shopify.com/s/files/1/0436/9547/2793/files/mixed_tenses_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/96670005444.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/rubikisusowenenedip.pdf
    • https://cdn.shopify.com/s/files/1/0447/3470/9914/files/ca_books_icap.pdf
    • https://cdn.shopify.com/s/files/1/0461/4950/1091/files/plane_simulator_2018_apk.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/rawob.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/ic_723_voltage_regulator_datasheet.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_off0000a387.bin
846072b5ebc54b2a84b3f4fb847899081594c6d2ee0cdf9ac05a62c25c8b94ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA387 5120 bytes
font_01_sfnt_off0000b4d4.bin
7371cd287cca94d767a0ed73069bcd86437be2dfb78377dad2a7b011d22e1fa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D4 10920 bytes

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