Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b3ef5574ca1f63…

MALICIOUS

PDF

30.3 KB Created: 2020-06-02 01:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 9e9c4cd480ce63c790bb3f11f58542ce SHA-1: de48fd1980b70e0449b446d5feae48c2acc51e7b SHA-256: 31b3ef5574ca1f63f6146635504a85213478f3c504ecc7fda216b5f5a59d6cc3
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, many of which appear to be part of a link farm designed to distribute malicious content. The document body text, though partially obfuscated, suggests a lure for downloading content, specifically mentioning 'Bittersweet symphony song download'. The heuristic 'PDF_SEO_LINK_FARM' strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://sibarita.net/uploads/1/3/0/9/130969150/130969150.html#bittersweet+symphony+song+download PDF link annotation
    • http://theduvalproject.com/uploads/1/3/0/4/130476242/vopopufun_samubem_mikebirazos_rusafude.pdfIn PDF document text
    • http://gracethomasdesign.com/uploads/1/3/0/6/130639300/856671808dbc1b.pdfIn PDF document text
    • http://justletyouknow.com/uploads/1/3/0/7/130739816/lapedom_tirom_sokefumusuk_tarev.pdfIn PDF document text
    • http://sibarita.net/uploads/1/3/0/9/130969150/terms.htmlIn PDF document text
    • http://sibarita.net/uploads/1/3/0/9/130969150/dmca.htmlIn PDF document text
    • http://sibarita.net/uploads/1/3/0/9/130969150/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://mimugolulame.files.wordpress.com/2020/05/98571689533.pdfIn PDF document text
    • https://bujavam.files.wordpress.com/2020/05/12062972503.pdfIn PDF document text
    • https://jisabiwofif966812601.files.wordpress.com/2020/05/jejugemekumopokadefij.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A6E 10580 bytes
SHA-256: 3dc4f26c0f7205cfdc5f7f57710b4060ac4185652067d2fc7ee72c4e50326aee

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