Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6b41924d951b8d…

MALICIOUS

PDF

41.6 KB Created: 2020-08-14 06:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 15ddea944ba4457ed409a66ec7a0c582 SHA-1: c822df9ae76334c11883a6585a7698056e80a149 SHA-256: ec6b41924d951b8de2dd86e82e650dc23a4b7879bc5199215629353b6dd23985
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirector infrastructure. The primary lure appears to be an 'Apprentice attendance sheet' which, when clicked, directs to a malicious redirector at 'https://ttraff.cc/pify?keyword=apprentice+attendance+sheet'. This redirector likely leads to further malicious content or phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection behavior.

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=apprentice+attendance+sheet In PDF document text
    • http://files.riverbarn.org/uploads/1/3/0/9/130969681/kuvitesajodatafaw.pdfIn PDF document text
    • http://buweboda.whatscookingella.com/uploads/1/3/1/8/131856158/kusogez_xubapepatab_tasabawib_zomuvukelanevon.pdfIn PDF document text
    • http://files.uciwpthinkbig.com/uploads/1/3/0/7/130775634/71e993da7c2c81f.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/1/0431/0899/1140/files/futebunapefupimizepifob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5353/0782/files/20438516037.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1758/4285/files/35145632537.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4218/4095/files/vusulanolegagivixarilebu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3271/4139/files/63839216309.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/71717684235.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/darkest_hour_cheats.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2574/3515/files/guvuxujaxuxupijanekuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1547/0245/files/nelewikazepejesanarul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2087/0044/files/21028750155.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4620/7650/files/32623469121.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0690/2950/files/37992487214.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 2

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_off00005f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8C 5116 bytes
SHA-256: 3d4cde45b8d95ed6d760537005d7be5c03fb2e7301a78c4a07d72551b121d97f
font_01_sfnt_off000070e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E1 12728 bytes
SHA-256: d9b0d41dabe0fd2953a8609be43cc5c6b09234857b98b1657f8452d4d85518cb

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