Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cf5bf0a8eb761e…

MALICIOUS

PDF

42.9 KB Created: 2020-08-05 00:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bffdf802da06efcefc4e338ecb7f0f59 SHA-1: e9f0c539342309841f8f8e3a54f2fd17cbca84bf SHA-256: 21cf5bf0a8eb761e090c1cba4cc7c453c3764a996328d0af3619c2971b309f27
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, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=disociacion+auriculoventricular+pdf In PDF document text
    • http://files.compassionvet.com/uploads/1/3/1/6/131606069/9206395.pdfIn PDF document text
    • http://files.sirbonifurnishings.com/uploads/1/3/0/8/130814340/gikiwigaluxu_nelixaxirum.pdfIn PDF document text
    • http://files.portoconference2018.org/uploads/1/3/2/7/132740193/9415129.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/1/0432/5294/0968/files/9972282908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/bunegunipisemabedumuponez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/weezer_say_it_ain_t_so_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/4280424599.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3237/9545/files/92881487812.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/bayesian_methods_for_data_analysis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5661/7877/files/sapakaniweken.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6997/2383/files/627406058.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1394/6018/files/68929974234.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8251/3561/files/dujinawer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4387/2150/files/37729481782.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_off00006a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4D 5208 bytes
SHA-256: d011dd3cd6e141cfa4d35a6732cab9758731e6303058aa91d7018104a431cc75
font_01_sfnt_off00007c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C22 10140 bytes
SHA-256: d6fa6e498f039c23fcc6b2a1744f672eb8ce1592638b055efee2a177b2902d2a

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