Malicious PDF — malware analysis report

Static analysis result for SHA-256 d421cdf93685aa81…

MALICIOUS

PDF

48.9 KB Created: 2020-03-22 03:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 035b9db2d835a41375e23f226a376438 SHA-1: 2281e4b718a5ce0650991cf3ed64d2ce0d9aeb5b SHA-256: d421cdf93685aa817653a69cd4c506fefb651d0ee3572efb0e9be4845ea7bfd6
92 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to an 'English grammar study book app' and includes URLs that point to various domains, suggesting a lure to external content. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to a large collection of linked PDFs, likely for SEO spam or to distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://tedrabinowitzcopywriter.com/uploads/1/3/0/9/130969824/130969824.html#english+grammar+study+book+app
    • http://escapethegulag.com/uploads/1/3/0/5/130588556/xosezotexib-dodaji-pufinowu-ximatetazujo.pdf
    • http://hostmaster.guitarland.it/uploads/1/3/0/6/130620469/1572509.pdf
    • http://nonnis-organics.com/uploads/1/3/0/3/130379315/bumuzuropanunoxi.pdf
    • http://dragonridercomix.com/uploads/1/3/0/6/130605279/7546659.pdf
    • http://pm.gruupmeet.com/uploads/1/3/0/2/130270836/rabutikerul_kekobovaru_busapomikes_nakidur.pdf
    • http://empowerfl.com/uploads/1/3/0/6/130604488/1b2ea6e131.pdf
    • http://robosail.org/uploads/1/3/0/3/130323146/juzelikesatujajemu.pdf
    • http://emilyruthjohnson.com/uploads/1/3/0/7/130775016/nujolepiwisodotenenu.pdf
    • http://safarikenyaconjuma.com/uploads/1/3/0/4/130483513/kofupe.pdf
    • http://5minutestofreedom.com/uploads/1/3/0/2/130288448/1791974.pdf
    • http://www.leeannlacerte.com/uploads/1/3/0/7/130740055/731bb995.pdf
    • http://goldynboutique.com/uploads/1/3/0/5/130551153/lesokomaz.pdf
    • http://inceptionsdesign.net/uploads/1/3/0/6/130621896/6465929.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d4d.bin
4447a802dabfc25307d940f03963c50d38b2fdaff14c98601dd48e725ad4a96a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4D 17056 bytes
font_01_sfnt_off00009519.bin
ef788c1a1e9370b5934e0210258b9442cee50f40f095ccb11f5ea70d0a92e84e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9519 8644 bytes

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