Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f3ecc964bf5356…

MALICIOUS

PDF

47.8 KB Created: 2020-08-04 03:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b6306bd249e985ad94d7161c42bceae0 SHA-1: 1ab89b7b804d4ebc3a88a598184bc9b638f0d399 SHA-256: 21f3ecc964bf535694fb418491c07a8e8f7c14ccef2ceae6d75a0cdaec478b3e
194 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many pointing to a redirector service, indicating a link farm or redirection attack. The primary link identified, 'https://ttraff.cc/pify?keyword=ncert+maths+books+for+class+6+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to educational materials, suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=ncert+maths+books+for+class+6+pdf In PDF document text
    • http://files.fromrustcg.com/uploads/1/3/1/8/131856331/worojegedipuba.pdfIn PDF document text
    • http://files.salvoselfdefense.com/uploads/1/3/1/1/131163723/5960249.pdfIn PDF document text
    • http://files.clearcreekwatershedcoalition.org/uploads/1/3/0/7/130739570/5269394.pdfIn PDF document text
    • http://files.theoldmillpondfarm.com/uploads/1/3/0/9/130969322/gotugirezokaper-gunopu-liwuvapa-kakulatata.pdfIn PDF document text
    • http://files.learndeveloplive.com/uploads/1/3/1/4/131453177/f1acd165cdf2.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/1/0437/5802/6903/files/susimeninimevekaxikaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9013/3663/files/wepijerese.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4949/2384/files/19200996256.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/julalu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9650/5496/files/lezudeder.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/53849942601.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7525/4937/files/dodebesalatanalitup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6345/9496/files/66646251365.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/61437877939.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/93834905728.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1974/8006/files/acoso_laboral_que_es.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5319/5165/files/73847179865.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/secondary_amyloidosis.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 8

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_off000070eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70EB 5720 bytes
SHA-256: 576aed84d256dc83a6a49650740772fd299c0649b2fbfeaf5de18bc0937809fe
font_01_sfnt_off00008437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8437 14752 bytes
SHA-256: ea67bb83e1a834f263b2b9877972a44d5de1c1a4bb88f288896c89cb88454d40

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