Malicious PDF — malware analysis report

Static analysis result for SHA-256 6631f19744e16b37…

MALICIOUS

PDF

33.1 KB Created: 2020-09-12 14:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f4f7987a5ac586458f5722c43f004ee5 SHA-1: 513e7e87b4240396ff566ecf0869a765d08fc358 SHA-256: 6631f19744e16b377b98a7f3f2fe3819f9fec1fd9b7d2cae0b2e888d46023314
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to a redirector service that is flagged as malicious. The document body, though heavily obfuscated, contains a URL that appears to be a lure for sheet music, leading to a malicious redirector. This suggests a phishing or scam attempt designed to lead users to malicious infrastructure.

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.cc/wix?keyword=jon+batiste+blackbird+sheet+music In PDF document text
    • http://sefosire.commonharvestcsa.com/uploads/1/3/0/7/130740563/0841419ef0f.pdfIn PDF document text
    • http://files.bortscincin.com/uploads/1/3/0/7/130739212/rijivubatum-wokofitekodarek-saberosi-disupokezisote.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/954c8b_408ed2e53d7d411fbe801c253726b5c9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/fd30ac_11a9a02f4a2645cb9bb940125d876c03.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2c76f4_cf2bdb69cabd468f823adb27ec270579.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a44510_4712e44bb21148a78401737daba8bebd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a4e402_3799cbff971f4c34b6d930b23f8944ec.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8bc2a6_421b8f6c9b634b5e97170ea23f910f20.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/21b4a7_12ae500e0f7540a89f902a8d48559db5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bb13a2_2d503c56a3b545cdbb9a7a1f4f6a859f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5ed537_e217d292d16d44e8b61b773e77f214f2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/defcb2_d5d24421d7b94ae59c7b5385618bd33f.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 3

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_off0000454c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x454C 5372 bytes
SHA-256: 1b46e972fc041912b5725a5683b95cac2b948c484408d4012f8eaf415e526e59
font_01_sfnt_off00005761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5761 9472 bytes
SHA-256: 88472dd61068667c6988bfd3335e4c866a9921b882633807f16ade43c7a7c11d

Open this report in the interactive analyzer, or submit your own file for analysis.