Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f58b2a309ebbcad…

MALICIOUS

PDF

53.8 KB Created: 2020-07-29 23:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62b6d7b6347f7e0796f0d6eefd6858f1 SHA-1: 8f6870fd6c5fd172a0cbf1d687f33f33cec260e4 SHA-256: 5f58b2a309ebbcaddb4b9c5fb159153e64d8005842d2910583d876ef2dd657b5
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to a known malicious redirector, suggesting an attempt to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links and the document's structure indicate a phishing or redirection attempt.

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://ttraff.ru/pify?keyword=aprendizaje+basado+en+problemas+definicion+pdf
    • http://files.nussme.org/uploads/1/3/2/6/132696335/javamidetebagik_nufedajevowewo.pdf
    • http://files.njokphotos.com/uploads/1/3/2/6/132695428/3288194.pdf
    • http://files.smallbatchq.com/uploads/1/3/2/6/132683267/38bb7f1578740.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2266/4348/files/kadulinenaneragitexapas.pdf
    • https://cdn.shopify.com/s/files/1/0435/7881/8715/files/xagububijapalijegapim.pdf
    • https://cdn.shopify.com/s/files/1/0439/7072/3998/files/ladoruvarikepejul.pdf
    • https://cdn.shopify.com/s/files/1/0436/7951/4777/files/xakokexa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/mamufugadesikivuxaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/7656/4630/files/dixofajegani.pdf
    • https://cdn.shopify.com/s/files/1/0435/7763/9075/files/verub.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3861/files/puzoxejenanapa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7876/files/ligurutesumuzila.pdf
    • https://cdn.shopify.com/s/files/1/0436/3947/2288/files/55749304990.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/gifulolonoramibasenixuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/vaxitaboro.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000912a.bin
72380135347b5718a420881e1ac56582a685e482696a5850260d4444e86a8c86
pdf-font-stream PDF embedded font (sfnt) at offset 0x912A 5264 bytes
font_01_sfnt_off0000a2e7.bin
ad7c388ab28d35cb4b2ba8ae02fd6dfd8cf764bbd9e88cc298b18f9cbc367502
pdf-font-stream PDF embedded font (sfnt) at offset 0xA2E7 11388 bytes