Malicious PDF — malware analysis report

Static analysis result for SHA-256 827d431c4f5ce89e…

MALICIOUS

PDF

44.8 KB Created: 2020-08-07 01:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5ebdf3644d7ef423de6d5f03b7ba8f7c SHA-1: ce9ef344688b4aede80372d2e14371f9700ecd1c SHA-256: 827d431c4f5ce89ef985bbbe8f12fc63e482fa66a837c0b0e464ce3db7862a88
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector link that points to malicious infrastructure, disguised as a free book download. The ML classifier strongly indicated maliciousness. The document body and embedded URLs suggest a phishing or scam attempt to redirect users to potentially harmful content.

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=business+school+book+pdf+in+english In PDF document text
    • http://files.johnblanke.com/uploads/1/3/1/4/131483685/zumapoxita-tofebejodir.pdfIn PDF document text
    • http://nekag.marwinvizslas.com/uploads/1/3/1/4/131454012/gekudidimub-jatebukoguv-viviwumevexofe.pdfIn PDF document text
    • http://files.virginianutritionists.org/uploads/1/3/0/7/130775021/maxib_kotivotinakiwo_dusovakageg.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/1/0428/9229/6359/files/dadotalaxeduwuvekodogi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/mezajojugenam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8533/8526/files/puxobomizaverol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/38938273200.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5035/2296/files/bocio_difuso_hiperfuncionante.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2416/1704/files/improve_speaking_english_fluently.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/12041511523.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8170/2303/files/atom_jsx_plugin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8747/6389/files/80618747751.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/mankiw_macroeconomics_7th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3748/9309/files/28889053103.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2192/4514/files/small_business_plan_example.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
🗂 Part of campaign: theperfectshipping.com 3 samples

Related samples 5

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_off00007186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7186 5364 bytes
SHA-256: 00e1bc8804d6914864f75081eea200781e4b428fe1c609b16606f99fa8c4f967
font_01_sfnt_off000083cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83CB 10060 bytes
SHA-256: 0a09333fd2ce73891c38d554aa4df54577ef5e1fc578618e9a5110ae931956a7

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