Malicious PDF — malware analysis report

Static analysis result for SHA-256 8521458d6cb437ed…

MALICIOUS

PDF

46.9 KB Created: 2020-08-25 13:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3766e04ec11493c349d3a1a7cccf816b SHA-1: b56937feaf377e6593adc683d01d8443d80f40f9 SHA-256: 8521458d6cb437ed8bc5bd6898f5c5d91e528ecd60310cf083e1718797e88945
202 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The document body and heuristics suggest a lure for free email templates, which is a common phishing tactic. The ML classifier strongly supports the malicious verdict, and the presence of numerous external links points towards a link farm or SEO spam campaign designed to distribute malware 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.
  • 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.
  • 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.com/pify?keyword=email+templates+freepik In PDF document text
    • http://kosik.leticiahuerta.com/uploads/1/3/1/8/131871699/zapuxodoxutes.pdfIn PDF document text
    • http://files.ausmazehanatkhan.com/uploads/1/3/1/4/131483719/nakokudifaxovukejet.pdfIn PDF document text
    • http://files.aplusservicesnz.com/uploads/1/3/2/6/132695629/vuzuzi.pdfIn PDF document text
    • http://files.cupidsinspirationuk.com/uploads/1/3/1/3/131381640/juxuvokop.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/1/0432/1850/1799/files/dear_santa_letter_template_for_kindergarten.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5280/0920/files/44148221213.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/83612064330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5462/0059/files/wepemolefopogabiwulo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5672/6165/files/sagikavemobajuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/dogegusikonorupafivoro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3339/5353/files/mokibagedumeluvigikurexux.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_off000079c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C7 5068 bytes
SHA-256: e292bf00570b61a8d521ec99165a55177063ad8d92bbf02a66d304cfe7c0f934
font_01_sfnt_off00008aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEC 10784 bytes
SHA-256: d250175651e0ba2be1d4eb508ff74a4943d161edc0c03b1fb3e03780aa3dc291

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