Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da5959b9ad8ad5e…

MALICIOUS

PDF

42.4 KB Created: 2020-08-09 18:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f058f152dc66231c53c02dc2a186e1c3 SHA-1: e43b7773aa7313b996fdcc50e159b52ed059f9fd SHA-256: 3da5959b9ad8ad5e68d578f0af0014fbc6a637f4aca39af764d6f115ed6a6b6b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body and embedded links suggest a lure related to IELTS preparation materials, designed to trick users into visiting malicious sites. The primary malicious IOC is the redirector URL, which likely leads to further stages of an attack.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.com/pify?keyword=makkar+ielts+speaking+pdf+may+to+august+2020+with+answers In PDF document text
    • http://files.fianzafund.org/uploads/1/3/1/1/131164456/xonemafuju-metapini-vafojekiwaxulis-viwupakorupon.pdfIn PDF document text
    • http://files.onesimplyiris.com/uploads/1/3/0/8/130874063/5da5b4048dc3.pdfIn PDF document text
    • http://files.dimikassari.com/uploads/1/3/0/7/130738779/6240933.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/wetelirutaruxokojabunumox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5306/2046/files/farove.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8562/5499/files/technical_analyst_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/lediripibimifaxamalal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7437/9173/files/atresia_colon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/fabufonaxesiwogemi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6504/8229/files/9874723782.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lufixupiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2182/7222/files/78110106488.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6895/4526/files/xonapesadibuwurixediz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BA 5992 bytes
SHA-256: e723246077340a019b2dad56a5937d7bf89a0d37d95560b14524812ec1594343
font_01_sfnt_off00007a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A23 10052 bytes
SHA-256: a55e7410c6b1b13661b1f770e3fb96404797fecc5b8afd0a6b8e5db7533c35ca

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