Malicious PDF — malware analysis report

Static analysis result for SHA-256 631736413c4f003b…

MALICIOUS

PDF

39.7 KB Created: 2020-08-21 07:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e9db14a3ce669c01bb06aa65754b3916 SHA-1: 347e3e95d5873e5d1c5d8a14e412fc23e49cac66 SHA-256: 631736413c4f003b7b6004892aaa511593ed6089cb7b8941713a7882065825e6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, disguised as sheet music. This suggests a phishing or scam attempt to redirect users to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL reinforces this assessment.

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=asgore+sheet+music+trombone In PDF document text
    • http://files.roaminggoatmi.com/uploads/1/3/1/4/131453213/renigu.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/1/0440/8157/8136/files/90642628425.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3903/8359/files/bomujumotetofuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4396/2532/files/81086949178.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0124/2022/files/19954077078.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4849/2438/files/3543305215.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7765/4935/files/berliner_platz_neu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/pawom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3905/5258/files/air_brake_system_project_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4575/4792/files/rotuxofugejozojamogano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7835/9967/files/glencoe_french_1_bienvenue.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 1

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_off00005064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5064 5100 bytes
SHA-256: b52d5e46c8bae1053a581e8e240fb32bf12ddcdb893d630e938e88b3b74692d4
font_01_sfnt_off0000619e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619E 14948 bytes
SHA-256: b95a5c24fbdc9f63f886e70780bf5e1c131ab69110738b196fe8840a792f8daa

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