Malicious PDF — malware analysis report

Static analysis result for SHA-256 132da7689c388f92…

MALICIOUS

PDF

42.5 KB Created: 2020-07-08 15:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67b55ed0b0a95d91ed377951a3ad328e SHA-1: 63a5543c4cd5cd1d8bdf4f799b493596c00ba72f SHA-256: 132da7689c388f92b8ef941aceafb1cf461e440783db693925d7a1de44d48feb
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a 'download pdf reader app for windows' prompt, which redirects to malicious infrastructure. The document also contains a large number of links to external PDF files, likely part of a link farm to improve search engine ranking for malicious content. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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.cc/wb?keyword=download%20pdf%20reader%20app%20for%20windows
    • http://files.ninelivestwine.com/uploads/1/3/0/8/130874629/vezik_gunefitotokek.pdf
    • http://files.counsellingpsychologist.services/uploads/1/3/0/9/130969555/7582248.pdf
    • http://files.custommade4paws.com/uploads/1/3/1/3/131384539/faluwunanusuro.pdf
    • http://files.lizetheron.com/uploads/1/3/1/1/131164007/sazugufamikixis.pdf
    • http://files.kcmetalsmithing.com/uploads/1/3/0/9/130969477/24a200741d33fd8.pdf
    • http://files.prairieviewchurch.net/uploads/1/3/1/3/131379049/1392456.pdf
    • http://files.bullbearkidsbooks.com/uploads/1/3/2/6/132681404/medewesiposade.pdf
    • http://files.425sqn.org/uploads/1/3/0/8/130814642/zotazaboma.pdf
    • http://files.sensibleshock.com/uploads/1/3/2/7/132740479/vasesejakukek_faxej_lelikam.pdf
    • http://files.maisonsouthernfrance.com/uploads/1/3/0/8/130874575/30855f0ab6447e5.pdf
    • http://files.mhsamerican.com/uploads/1/3/1/8/131856950/e0fe2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://mivomuva.files.wordpress.com/2020/07/80219073841.pdf
    • https://wonudat.files.wordpress.com/2020/06/19846964795.pdf
    • https://wukaritesir.files.wordpress.com/2020/07/30635756468.pdf
    • https://relininomovu.files.wordpress.com/2020/06/kubapidefevav.pdf
    • https://zexarepig.files.wordpress.com/2020/07/jufexiwusilapagotiji.pdf
    • https://putasadasota541167068.files.wordpress.com/2020/07/sexutoxub.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_off00006a3f.bin
10069efe61f74f9402ad6f293f1c5e9cc08fac8e7d503e1ef01e777ec1dd5ca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3F 4832 bytes
font_01_sfnt_off00007ac0.bin
065727640b8889fd77760c717bcb950584e879a7f7d4d1cc74a129186d79cde0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC0 9968 bytes

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