Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4656f231a2f9892…

MALICIOUS

PDF

43.5 KB Created: 2020-07-24 15:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b100a2a717bb00db35fe5c6b50dea7f3 SHA-1: 98e07c3dd433ec0336ac9c7a95f41cbe37fe8e95 SHA-256: b4656f231a2f9892896e59fc006bb2cdc5acec7cb290aeed67cd73f4e3ef64a4
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a malicious URL. Additionally, PDF_SEO_LINK_FARM suggests the document is part of a link farm designed to attract traffic. The ML classifier strongly supports the malicious nature of this PDF. The primary lure appears to be 'Libertango free sheet music', directing users to a redirector URL.

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=libertango+free+sheet+music In PDF document text
    • http://files.rtsbowlingstore.com/uploads/1/3/0/7/130775490/526c10ad477b.pdfIn PDF document text
    • http://files.diguptheyard.com/uploads/1/3/2/6/132683168/wugabap_sarat_batuwojaluzimi_jovaj.pdfIn PDF document text
    • http://files.holisticwisdomandwellness.com/uploads/1/3/2/6/132682093/63c7301eed7f.pdfIn PDF document text
    • http://files.childrenscoalition.org/uploads/1/3/1/4/131452942/8212627.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/1/0432/2459/6642/files/wusujaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7199/6053/files/69648230704.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/48030774634.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7217/5781/files/zebemigaditukasobo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0708/0610/files/59610750500.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6327/9767/files/20392139508.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8228/5216/files/danukodigademekiju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/darab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/50085042103.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0840/9250/files/lasunizitemisasi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/1328121900.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
🗂 Part of campaign: zummoscafescranton.com 6 samples

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_off00005fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEA 5228 bytes
SHA-256: a2fcca82cade92906b594d96054baa90dd084aaf6d028eb6204fc0838565b34d
font_01_sfnt_off00007182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7182 15412 bytes
SHA-256: a66cb03493a43269abcdbcc18023b521c930e98b91e8a6956b7ed60d1405eec3

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