Malicious PDF — malware analysis report

Static analysis result for SHA-256 87115301bfe73623…

MALICIOUS

PDF

36.2 KB Created: 2020-08-03 11:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: afbd4eb8b4419002eb7b968c072d5fb3 SHA-1: 35089a99b132f0d5896f046d737dd818279bc894 SHA-256: 87115301bfe7362300c026512fcbee858a1ae41ed2b4130bf695326c5886f103
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service, suggesting a link farm or phishing lure. The primary redirector URL is associated with malicious activity, and the document body contains text related to reducing PDF size, likely a pretext to encourage clicks. The ML classifier strongly indicates maliciousness.

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.ru/wb?keyword=how%20to%20reduce%20pdf%20size%20adobe%20reader%20xi In PDF document text
    • http://files.vallenduuk.pl/uploads/1/3/1/8/131872048/munaxatop.pdfIn PDF document text
    • http://ruzada.btmuth.org/uploads/1/3/1/8/131856476/fubud.pdfIn PDF document text
    • http://files.way2heal.com/uploads/1/3/0/7/130739590/5708908.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/1/0431/0158/5570/files/jusiwixo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/4130922211.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4282/4611/files/3372400322.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7130/5896/files/92359096705.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1567/5809/files/91579642351.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuvuwagel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/pavakixopiwikiruson.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7103/6835/files/89118948071.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4716/5850/files/nenuwat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gojifazuxosupimuron.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5416/1310/files/35614319455.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3939/0872/files/adobe_indesign_trial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97897646990.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_off00005030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5030 5428 bytes
SHA-256: 15ef6fda0ce6fe3d88736a6748a531f33c906f7c5685b526f89efa64707f489d
font_01_sfnt_off000062ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CE 9784 bytes
SHA-256: a3531008efa1445d2c034961e8814652dfe9e1f18cd151ee0a7ae6199b7797af

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