Malicious PDF — malware analysis report

Static analysis result for SHA-256 88137ea608c1e54b…

MALICIOUS

PDF

70.4 KB Created: 2020-07-27 08:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 9741268f3fb9e1a698184ed777220545 SHA-1: ced14a5fa1753dabc82ed9dce4ae44f714da50c0 SHA-256: 88137ea608c1e54bace39a49fc20a7fee3e7e00a5607c7f71c308f16bf910ca2
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm, with one prominent link redirecting to a known malicious URL. The document body, though heavily obfuscated, appears to be a lure for sheet music, likely to trick users into clicking the malicious link. The ML classifier strongly indicates maliciousness.

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.ru/pify?keyword=bach+fugue+1+sheet+music In PDF document text
    • http://files.amybrandis.com/uploads/1/3/1/8/131856277/4db90de00.pdfIn PDF document text
    • http://files.q-avery.com/uploads/1/3/0/9/130969265/2821098.pdfIn PDF document text
    • http://files.roadtriptravelogues.com/uploads/1/3/2/8/132814996/6026156.pdfIn PDF document text
    • http://files.tinyfosterkittens.com/uploads/1/3/1/4/131453365/1312348.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/1/0428/6670/4550/files/kewigalosukenesalabizoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3910/4917/files/rivabunezu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3452/6375/files/reduzisajupanuxuvu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0433/8073/files/gujokabikuvozovefe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/17378748246.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8857/6661/files/nunox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/56917623398.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9607/1578/files/kivagimotetosigolu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6900/6236/files/jozugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/36755933676.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC191 4932 bytes
SHA-256: 26d97d47ba9fded665736b57207b2f69f8a6097a8aabda3c792f40c9c10f5ef6
font_01_sfnt_off0000d26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26C 10648 bytes
SHA-256: e55f020e2f7c02e7b37be9acbbfd25d336750e664b4f460535209f8bf7cd985b
font_02_sfnt_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 16120 bytes
SHA-256: fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd

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