Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fa4d3cfef5bade…

MALICIOUS

PDF

58.7 KB Created: 2020-08-07 05:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e5bb6681d3f52b71fdea901b1d904bf SHA-1: 8222579ba16619027d858e130e80bafd5910a190 SHA-256: 66fa4d3cfef5bade2f9dcfee224608e65341708864e94e390de1d685fbc04af4
174 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to potentially malicious redirectors or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of the lure, directing users to external sites. No scripts were extracted, but the structure suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.ru/pify?keyword=livro+de+analise+swot+pdf
    • http://lowezomil.photowalsh.com/uploads/1/3/1/4/131453555/5748026.pdf
    • http://files.donandmargieabroard.com/uploads/1/3/1/0/131071076/f2b818fc74ed0.pdf
    • http://fadur.solidrockmasons.com/uploads/1/3/1/0/131070146/xutatuf-vuzuforujuvu.pdf
    • http://files.rkspeech.com/uploads/1/3/1/4/131438249/9075954.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7244/6873/files/printable_abc_coloring_pages.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6293/files/32222935674.pdf
    • https://cdn.shopify.com/s/files/1/0437/2905/9991/files/satllite_canceling_stuck_tasks_runnnning.pdf
    • https://cdn.shopify.com/s/files/1/0437/8751/8104/files/63096842938.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/62085288694.pdf
    • https://cdn.shopify.com/s/files/1/0436/2053/2386/files/muzavibifurutaguko.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.pdf
    • https://cdn.shopify.com/s/files/1/0438/0560/6049/files/society_bye_laws_2020_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0439/1501/8392/files/teratumobifiba.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/bozezaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8058/1274/files/24966367392.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_off0000a9d7.bin
f5e574bc77e99c2eb0b7f1edfeebda7c7bb1de2f03d8d9ed55dcf6080b997e6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9D7 5128 bytes
font_01_sfnt_off0000bb74.bin
3cd43e04100ef88f950c9ec00738bbed7464902f18745b27196b2e6515b90b26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB74 10008 bytes

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