Malicious PDF — malware analysis report

Static analysis result for SHA-256 f991fb6f238be484…

MALICIOUS

PDF

55.3 KB Created: 2020-04-02 18:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e7448566a7fea14f3039e56bd6206d47 SHA-1: b6acfe304e00997e876fc8b70fb5525be4ff91f8 SHA-256: f991fb6f238be484eb6f046916b9d83de367c12fb3f80cebe72be8b75635573a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which follow a pattern of numeric slugs and are hosted on domains that appear to be part of a link farm. The document body, though heavily obfuscated, contains a reference to 'Skyrim sexlab animations not lining up' and several URLs, indicating a lure to external content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://xciteeducation.com/uploads/1/3/0/5/130550976/130550976.html#skyrim+sexlab+animations+not+lining+up
    • http://5125907747.com/uploads/1/3/0/8/130873841/4208802.pdf
    • http://mail.chardontomorrow.org/uploads/1/3/0/6/130639407/9098110.pdf
    • http://skaperstedet.no/uploads/1/3/0/9/130969355/nepomi-xatugel-pisewekoma.pdf
    • http://gingerplumboy.com/uploads/1/3/1/0/131069824/9481773.pdf
    • http://stellarbrows.com/uploads/1/3/0/8/130874276/9900071.pdf
    • http://earthrightsnow.com/uploads/1/3/0/5/130550715/f5c2cf16346bc7.pdf
    • http://mspritchett.com/uploads/1/3/0/8/130814782/1914173.pdf
    • http://dollarsfordoorsllc.com/uploads/1/3/0/3/130323318/bd584.pdf
    • http://wilsonceramicsknives.com/uploads/1/3/0/7/130776564/4946753.pdf
    • http://bixation.com/uploads/1/3/0/2/130271157/37c149264f286f.pdf
    • http://lisajaynewest.com/uploads/1/3/1/0/131070351/vufuvaxapubusek.pdf
    • http://cuttingedgepainters.net/uploads/1/3/1/4/131483018/medarotevufoderelu.pdf
    • http://admin.premierdoorservices.co.uk/uploads/1/3/0/6/130603760/zajojafupikofezug.pdf
    • http://cheveuxlakay.us/uploads/1/3/0/7/130740140/4961438.pdf
    • http://mail.shoreliteracy.org/uploads/1/3/1/4/131406650/9366da0fcab.pdf
    • http://jefro-invest.com/uploads/1/3/0/8/130813769/pegobesegefom.pdf
    • http://malokuhome.net/uploads/1/3/0/6/130604848/8054909.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_off0000af82.bin
37b496bbe5412b2dc3a0eb5fae1f0c820ae01b5795563c1a055a194c27546a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF82 8376 bytes

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