Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff8f7fa155d3971…

MALICIOUS

PDF

40.0 KB Created: 2020-08-07 08:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4d2b628fa5a07b0fc3e9a9963931caf1 SHA-1: 63dab2c5b157b87655b3baa8a979c6bdf78f5479 SHA-256: 8ff8f7fa155d397138b7ea9928371799a59435e4d2e2a5c1d6f44c60b5189c31
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a mass of external links, masquerading as a document about teacher absenteeism. One of these links, 'https://ttraff.com/pify?keyword=causes+of+teacher+absenteeism+in+schools+pdf', is identified as a malicious redirector. The document's structure and the presence of numerous links suggest a link farm or phishing attempt designed to lead users to malicious sites.

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=causes+of+teacher+absenteeism+in+schools+pdf In PDF document text
    • http://files.palisadescc.org/uploads/1/3/0/7/130739233/potomumo_sinok_nufiparebokod_sefosozo.pdfIn PDF document text
    • http://files.zhiguohe.com/uploads/1/3/0/7/130775304/20b19caba8.pdfIn PDF document text
    • http://files.garryoak.info/uploads/1/3/1/4/131410094/c9116763d2.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/1/0439/3972/5470/files/kufim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2730/7416/files/kimurepalamareba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9886/3771/files/belajar_membaca_tk_pdf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4409/1557/files/bupawosefopikitav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7612/4821/files/1707860172.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3909/5973/files/rorenetalokunezuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/65691454403.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6649/1041/files/zirusegewavilirigarozovo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/buwujeximamed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2517/0595/files/savawavex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1306/1277/files/13367972204.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6312/2843/files/41623517521.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 7

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_off00005f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F74 5440 bytes
SHA-256: 94110df2f89963e5b1bc93fa2fc095c6d43a2f9bd8d7ca764693853364dea4a9
font_01_sfnt_off000071bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71BC 9760 bytes
SHA-256: 549553b638953c93bf329ff9e39c34c41263c4a9d088146c1af314cac2d1022f

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