Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91ea70b0ad6f3fa…

MALICIOUS

PDF

43.1 KB Created: 2020-08-22 11:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cea8044e2e77894ff8bc4109eeacd17a SHA-1: 42f96745508ca5ed7afa5b6635a89d3ceb79433c SHA-256: a91ea70b0ad6f3fa83a0f91e24faa6ff90723d598920cbb2327d78f7a5d4cdfb
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service, suggesting a link farm or phishing campaign. The primary lure appears to be 'free 1920s jazz sheet music', which redirects to a malicious URL. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs and a link farm points to a social engineering attack.

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=free+1920s+jazz+sheet+music In PDF document text
    • http://files.yorkieskisses.com/uploads/1/3/0/9/130969461/sepakogitopo.pdfIn PDF document text
    • http://topew.whiteeaglereiki.com/uploads/1/3/1/3/131379858/rodijamujawomi.pdfIn PDF document text
    • http://files.speakingofveganfood.com/uploads/1/3/1/8/131857914/motab.pdfIn PDF document text
    • http://files.haysvillehornets.com/uploads/1/3/1/6/131636655/bofadubat_sinisasibowabo_febasunagoroke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5055/5799/files/scp_containment_breach_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82191842179.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1608/5923/files/gizomarazapuralijifivoder.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8748/7385/files/rest_api_doc_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/82615999640.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0654/0445/files/nafamupo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6036/2392/files/jusugusotevepojufimipunom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7624/7971/files/2127088977.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 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_off00005e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E29 5236 bytes
SHA-256: 5b03181d3e8b96dd13f3d9aac204a93170199beb3b1256b711f8902ccf6ec72d
font_01_sfnt_off00007002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7002 9888 bytes
SHA-256: 6e04f5bf84eabce54dd51262d6b079a30e8742e9e2d53c251b950b3b79fbb065
font_02_sfnt_off000091dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91DC 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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