Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96951b5ff1a4b00…

MALICIOUS

PDF

71.6 KB Created: 2020-10-08 03:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f2824fcd83ec8014443689c3325e523e SHA-1: 18fc851b5143d03874c5d2d26717c354a01acecf SHA-256: b96951b5ff1a4b006d7a188f812df53b1846efe5b5bab055cd3084e80e397f16
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were extracted, the overall structure and link distribution strongly indicate a malicious intent to redirect users to potentially harmful content.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/pify?keyword=hawkwind+silver+machine+lemmy In PDF document text
    • https://site-1038772.mozfiles.com/files/1038772/megipuro.pdfIn PDF document text
    • https://site-1039846.mozfiles.com/files/1039846/ruremilewodivutoruwobe.pdfIn PDF document text
    • https://site-1037182.mozfiles.com/files/1037182/81414185086.pdfIn PDF document text
    • http://zejeb.samui-select.com/uploads/1/3/0/8/130874683/wojakaxofoxemugivedi.pdfIn PDF document text
    • http://files.splashdogwashing.com/uploads/1/3/1/8/131857631/445bb39830.pdfIn PDF document text
    • http://files.srpdesignstudio.com/uploads/1/3/0/8/130814868/fuzenidenazu.pdfIn PDF document text
    • http://zetikuva.rcbnorthwestern.com/uploads/1/3/1/3/131379434/zixiguwerelosol_wetiduvu.pdfIn PDF document text
    • http://nojeruv.momentumptnp.com/uploads/1/3/1/8/131856706/1300366.pdfIn PDF document text
    • http://files.wvrra.org/uploads/1/3/1/1/131164358/1959921.pdfIn PDF document text
    • http://files.designopus.net/uploads/1/3/2/6/132681625/8852755.pdfIn PDF document text
    • http://gevufape.fleischerstudios.com/uploads/1/3/2/6/132680981/ruxomu.pdfIn PDF document text
    • http://files.mss1.ca/uploads/1/3/2/8/132815220/f7939a.pdfIn PDF document text
    • http://nedoxexo.monteithhouse.org/uploads/1/3/1/6/131637921/3404962.pdfIn PDF document text
    • https://site-1039210.mozfiles.com/files/1039210/11522204323.pdfIn PDF document text
    • https://site-1038313.mozfiles.com/files/1038313/kawevupenur.pdfIn PDF document text
    • https://site-1039279.mozfiles.com/files/1039279/vajixeparuzesid.pdfIn PDF document text
    • https://site-1039899.mozfiles.com/files/1039899/kajasogon.pdfIn PDF document text
    • https://site-1036829.mozfiles.com/files/1036829/20606072916.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 5460 bytes
SHA-256: 9f5be202dd23ef17b72333c3e5358297bc6e43f3e9d32f7f66e0c214a57f7241
font_01_sfnt_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 10300 bytes
SHA-256: 917b62062e58d24df4720d4352a945345778da3cf63da24030a21423fb027b92

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