Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bd3d53ffa35134…

MALICIOUS

PDF

58.3 KB Created: 2020-10-09 10:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 653953137188113c03b4894ef5fff59f SHA-1: b748c084ada7880aacea632d5240c73205ba2bcf SHA-256: 99bd3d53ffa351342b48d7abfb84caa468f865a907f809d6a9252c547a010386
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector. The document body, though heavily obfuscated, contains a URL that points to a malicious redirector, suggesting the primary purpose is to redirect users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/pify?keyword=shogun+james+clavell+pdf In PDF document text
    • http://files.journeytomichelin.com/uploads/1/3/1/6/131637679/jovadaxoposini-malugozufevi-zovazuk-xewupibi.pdfIn PDF document text
    • http://rodoruv.shinebrightdance.com/uploads/1/3/1/0/131070356/mubizo.pdfIn PDF document text
    • http://files.creekwoodanimalhospital.com/uploads/1/3/1/4/131406036/bevotonoguba.pdfIn PDF document text
    • http://jafaxo.katedickersonart.com/uploads/1/3/0/7/130776769/zuwogegikolodomu.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://uploads.strikinglycdn.com/files/03144560-612e-4c01-9ce0-60b0f9cec83c/wixutapodakotabigidiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f78954c4-0347-4a49-8fca-bce769629d2a/kexirat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5919502d-0bbc-45bc-be54-e32351e0cde8/72628871531.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3923/5989/files/vebukegapa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0352/2468/files/tiliwifowapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5901/8408/files/kaxaketefifexajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39114b20-de78-450c-8356-6d0611a3f530/9093965135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f6f6eb-c8a0-475f-9e97-d457899b986d/50323086276.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9667 5464 bytes
SHA-256: 1ec5e8f679af5add7942eee5fffa14d11bdc63542fe21db025da8e3173c6f6ae
font_01_sfnt_off0000a8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8E7 11120 bytes
SHA-256: bb0cffbb2c9e084405215347822751c7f7b95f7a8602f1e81d1ccfa585e32464
font_02_sfnt_off0000ce1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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