Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b91cc170fac1600…

MALICIOUS

PDF

45.3 KB Created: 2020-08-10 02:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf8cd02149fe2b28f3581db21152d956 SHA-1: d3415915fdf14ae18c5eb6730bb8803597dbad37 SHA-256: 5b91cc170fac1600f21f98eed0f0d53d187c48938c3913491a8605c40607e91d
182 Risk Score

Malware Insights

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

The PDF contains a lure related to nursing entrance exams and includes numerous links, one of which points to known malicious redirector infrastructure. The document body, though partially corrupted, contains text referencing the exam and the malicious URL. The presence of multiple PDF links, many hosted on Shopify, suggests a link farm intended to distribute malicious content or phish users.

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=ruhs+bsc+nursing+entrance+exam+paper+2020+pdf
    • http://files.vegasvowsforfree.com/uploads/1/3/0/7/130776263/zatizex-wekomol-zomizekadapu.pdf
    • http://files.stacyparkerjoyce.com/uploads/1/3/1/8/131857334/b0d8142.pdf
    • http://files.rioxpvista.com/uploads/1/3/1/6/131637034/36c763c9765.pdf
    • http://files.reginamartyn.com/uploads/1/3/0/9/130969185/larilip.pdf
    • http://riwumu.maplegrovepta.org/uploads/1/3/1/6/131606407/lejapanuferes-koloxafotetat-zudidom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9336/0791/files/kogolax.pdf
    • https://cdn.shopify.com/s/files/1/0438/8074/3080/files/walter_benjamin_violencia.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6341/files/tupapinifivifareboxipo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/80577663871.pdf
    • https://cdn.shopify.com/s/files/1/0443/5968/0156/files/youth_civic_engagement.pdf
    • https://cdn.shopify.com/s/files/1/0433/7798/3653/files/47904946131.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4823/files/kexatikav.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5003/files/bank_of_baroda_current_account_opening_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/53703885283.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/mojer.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/mavodisusanu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/cutnell_physics_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/6551548873.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_off0000687f.bin
12aa13425336ffe825b558a202a73634eab882c5813a3456a9a14998c883672b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x687F 6028 bytes
font_01_sfnt_off00007ce2.bin
548e7e0b692f05dec51ae3e80dc52fa3980b49da3693e3963567fc0746689142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE2 13760 bytes

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