Malicious PDF — malware analysis report

Static analysis result for SHA-256 c454f160b31138b0…

MALICIOUS

PDF

42.6 KB Created: 2020-04-07 11:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b952bf81d0d7ee0e3171892f334247b8 SHA-1: 99be20a95e8d35753b871944fca5c3a1dbd31c42 SHA-256: c454f160b31138b09fecf53bff51ec1d03938b960777fd7e87fd3528220f2b13
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named PDFs hosted on unrelated domains, indicating a link farm or SEO spam tactic. The document body, though partially corrupted, contains text related to calculating break-even points and references wkhtmltopdf, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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
  • 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://worldcare.vip/uploads/1/3/0/3/130323377/130323377.html#formula+para+calcular+el+punto+de+equilibrio+operativo
    • http://jaxgadgetgirl.com/uploads/1/3/0/5/130590265/1757189.pdf
    • http://ecreativegp.com/uploads/1/3/0/5/130588943/zefajenimoxi.pdf
    • http://lovelashesbypao.com/uploads/1/3/1/0/131069961/gexewadikolupux.pdf
    • http://cyvernetics.org/uploads/1/3/0/6/130603989/9868449.pdf
    • http://photomepro.com/uploads/1/3/0/7/130739490/1a0c2a81ecb.pdf
    • http://levelupintuition.com/uploads/1/3/0/8/130813906/60bc93380ee8ec.pdf
    • http://tieriiillc.net/uploads/1/3/0/5/130551127/e7005f6.pdf
    • http://lucky13.org/uploads/1/3/0/6/130620343/7666190.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_off000079a5.bin
0e225f4a94a5eab348bac57e3b23526b3d690705b2261285f09b8545a9632f2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A5 9432 bytes

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