Malicious PDF — malware analysis report

Static analysis result for SHA-256 8988d66f1052b944…

MALICIOUS

PDF

39.3 KB Created: 2020-08-11 21:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 171efec818175a7165d3ef28e6a38b75 SHA-1: fdf5638fa29f8be00d8d4edbabc71d0dc3fa1e16 SHA-256: 8988d66f1052b9442c8753eca835f4a318e148ff849c5b8689b38795c93250bb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body and heuristics suggest a lure related to 'Aprendizagem colaborativa livro pdf', likely a phishing or scam attempt to drive traffic to the malicious URL. The ML classifier strongly supports the malicious verdict.

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=aprendizagem+colaborativa+livro+pdf In PDF document text
    • http://files.blatherscatdesign.com/uploads/1/3/1/3/131379639/funefemevulidikidafa.pdfIn PDF document text
    • http://files.sparksprotectionusa.com/uploads/1/3/0/9/130969663/wavetigaka_sawakuzudetijug_bogiroxekox.pdfIn PDF document text
    • http://files.researchjunction.net/uploads/1/3/2/7/132740756/nekotuvaz.pdfIn PDF document text
    • http://tinikasal.dennisvanderspoel.eu/uploads/1/3/1/4/131482952/766801.pdfIn PDF document text
    • http://files.manateehavendecorativeartists.org/uploads/1/3/0/7/130776573/3650082.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/1/0436/9724/2280/files/dikux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gopag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/fevigodenifotivipuvere.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/vozofizosifosomiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1848/5923/files/gugofawigitowuwosipew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8756/0858/files/baixar_app_para_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5241/6672/files/22218375388.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/11431606925.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4363/2805/files/52657665087.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5296/5792/files/analectas_de_confucio_gratis.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_off000056b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56B2 5536 bytes
SHA-256: 6c4b718fb147c485b959b35ad6239d251a82bceaf7e2ac3eda6b780e483df298
font_01_sfnt_off00006978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6978 12112 bytes
SHA-256: b588e7f79c5c0c6e47e49a5819426629d97179f58ef2ffcd5fb4557215b72d18

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