Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf731e550eee360…

MALICIOUS

PDF

44.0 KB Created: 2020-08-21 16:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 905fb5bb9f76b9e6e58ddb991f2b300b SHA-1: d1cb2897c18c9398477e42d91a8e8651a125f9dd SHA-256: 4cf731e550eee360bf5ac795d114e205dfef391f518a3b837c28532c520c0663
194 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is https://ttraff.cc/pify?keyword=actividad+epileptiforme+generalizada. The document body contains garbled text but also includes the same malicious URL, reinforcing its presence. No scripts were extracted from this sample.

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=actividad+epileptiforme+generalizada In PDF document text
    • http://files.clkdesign.ca/uploads/1/3/1/6/131606630/fogamo_dilufaresusaxek.pdfIn PDF document text
    • http://milikugeg.suelidesigns.com/uploads/1/3/1/3/131398440/3792034.pdfIn PDF document text
    • http://files.detourtowonderland.com/uploads/1/3/1/3/131381675/pikixebikosalop.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/1/0434/1540/4695/files/sabufurobobusatovo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/98298120210.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/bamekigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4118/5189/files/japobogi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7437/9164/files/introduction_to_general_zoology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/madhyamam_malayalam_calendar_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/32975760101.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4279/1839/files/nagig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2652/0986/files/adecco_salary_guide_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1226/7937/files/clumsy_ninja_mod_money_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3569/5016/files/spectral_and_magnetic_properties_of_lanthanides_and_actinides.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6749/8911/files/33826888177.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8429/9936/files/96306380255.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_off00006a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A52 5396 bytes
SHA-256: 8e26f30b044d3a665ac6c905897c47a1522242a2975402898b9bae5567dd4a19
font_01_sfnt_off00007c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9D 11440 bytes
SHA-256: 682ed2e97ea21806781374621d98d14880fac549b9ae18f94a85336b81533f1c

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