Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b01836bfac513d…

MALICIOUS

PDF

39.9 KB Created: 2020-08-10 15:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f83d5959ac46063e92ebb0dbab04cbcc SHA-1: 304451035e184dbd099a2f00500ef18bd89f307c SHA-256: 21b01836bfac513d95d9c422d9bc6b5e52b0e661a7e31951a80c21fad757a6e2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a link farm designed to lead users to malicious content, likely for phishing or malware delivery.

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=brush+pen+lettering+grace+song+pdf In PDF document text
    • http://files.bucketsforjesus.org/uploads/1/3/1/4/131414516/rujuraneno.pdfIn PDF document text
    • http://files.646studios.com/uploads/1/3/0/8/130813696/789220.pdfIn PDF document text
    • http://files.upnorthrd.com/uploads/1/3/0/8/130814676/kajewuregawip-bisoz-bariwobizuxum.pdfIn PDF document text
    • http://files.agimba.org/uploads/1/3/1/4/131453713/2a9f6a1a93f5.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/1/0430/0098/7801/files/99656238073.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7741/0720/files/46615107152.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4592/0669/files/fugifedexiniviziw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/gejitepifenedovowapodupuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5382/5694/files/vizitowiziwasikixax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0682/7428/files/xuzodatozevifiri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4424/9504/files/vapapuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/vuxibi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8132/5987/files/zuzepesufepipogon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4839/4143/files/xapinozipelade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gomejalubewetilukifij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1829/5195/files/vebodux.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 3

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_off00005bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD1 5468 bytes
SHA-256: 0ac0d445a02fcdf6370be7531d781910ec40fc392281325cd12e6b84e3b4a930
font_01_sfnt_off00006e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E60 10700 bytes
SHA-256: 46a1d16dcaf97ebdaf3bbe5be93f0105aa208d386abdedb5e2cd7b4e7c7558d4

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