Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d12356d7635151…

MALICIOUS

PDF

41.5 KB Created: 2020-08-03 16:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 83b014ae866f110d2b25624ae5f3b18c SHA-1: a120fa42f73fd652a7f28d30954ff82ce93a4853 SHA-256: 28d12356d76351518a8ef3aaa326ee137ae877b8177cc6335ffe0e8e2d4ea996
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, contains text related to a 'treble clef notes worksheet pdf' and a URL pointing to a redirector. This suggests a social engineering attempt to trick users into visiting 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=treble+clef+notes+worksheet+pdf In PDF document text
    • http://files.ueshirofloridakarate.com/uploads/1/3/1/8/131856072/zofekofi_nopil_rakezisup_mobadojegifi.pdfIn PDF document text
    • http://files.captaincillian.com/uploads/1/3/0/7/130739238/fojifumonod_kiwogi_kumiva_xegok.pdfIn PDF document text
    • http://limuku.dylanbeddow.com/uploads/1/3/0/7/130740025/6473540.pdfIn PDF document text
    • http://nugusi.millersgardenservices.co.uk/uploads/1/3/0/8/130814575/xajaselejediwef.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/1/0428/3318/2886/files/36212068680.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5083/5878/files/9932299366.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1885/4306/files/96772358919.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4037/2896/files/bojitemikixufopopo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/maxon_liftgate_troubleshooting.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6825/2565/files/93686507756.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/malopemax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7270/7990/files/49730779225.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/dedibitugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5366/1858/files/foduvagojizagol.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 5

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_off000062be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BE 5276 bytes
SHA-256: 93532ffce156e7b570cd58c9dcda11994b327c0701e5aa4132c90d8460abaf6f
font_01_sfnt_off000074be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74BE 10204 bytes
SHA-256: 545872a06cb37ff64c8ffd5b2ecc25b06d477e8601553111baf5c30e3dc8802b

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