Malicious PDF — malware analysis report

Static analysis result for SHA-256 466a52f1dae6f9c9…

MALICIOUS

PDF

56.0 KB Created: 2020-04-30 19:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dc33e3a92a623336e59e6bc8e2117c0f SHA-1: 429f328cd516539dada114539b70642b5edf3048 SHA-256: 466a52f1dae6f9c9e0df5f4c1f27ca3f9a183cbc49507b131958256391dcc62f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains references to 'Bleacher report nfl picks week 4', suggesting a lure to attract users interested in sports content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports a malicious intent, likely to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://atasteofjamaicaandmore.com/uploads/1/3/0/4/130479570/130479570.html#bleacher+report+nfl+picks+week+4
    • http://borgicdesigns.com/uploads/1/3/1/4/131437926/9f5daa6ed0eecc.pdf
    • http://bangkokog.com/uploads/1/3/0/7/130739597/bevovas_dijulefonufibo_balesosi_talojigikinon.pdf
    • http://cristianriveratapia.com/uploads/1/3/0/7/130740378/2870473.pdf
    • http://donlagreca.com/uploads/1/3/1/3/131383592/8953015.pdf
    • http://autodiscover.maxxglassfg.com/uploads/1/3/1/6/131637385/9939933.pdf
    • http://nexstepss.com/uploads/1/3/0/7/130775573/nogotef.pdf
    • http://ptsclean.net/uploads/1/3/1/4/131407507/naxelizawamedi.pdf
    • http://surrealdimensionsannapolis.com/uploads/1/3/1/4/131437291/3593258.pdf
    • http://phase3technology.com/uploads/1/3/0/8/130814219/bd0bcbb1.pdf
    • http://tammysmithmassage.com/uploads/1/3/0/4/130436188/tigoxanotepuzu.pdf
    • http://counterpointservices.org/uploads/1/3/0/7/130776110/zibifosug_liwezudulob_milizirozebalu_debabexajiwutok.pdf
    • http://nationalsolargroup.net/uploads/1/3/0/8/130874233/3121631.pdf
    • http://knightsaccountancysolutions.com/uploads/1/3/1/8/131871408/rixeni_fexonadelusi_lexogolusijaro_tujatu.pdf
    • http://twf.solutions/uploads/1/3/1/4/131438499/44862.pdf
    • http://ontotheblue.com/uploads/1/3/0/4/130475923/9811f5a.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3eb.bin
29de209aefd299327ad1c09ad5b757d9739e90c4de401436b8546410a586b6cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EB 8268 bytes

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