Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d384e9de07305e…

MALICIOUS

PDF

30.8 KB Created: 2020-03-26 07:32:57 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ac7330275ec67283f07bdb99a708604f SHA-1: 7b0a033c6f9aa323a72b9fea3c837accd927c94e SHA-256: 10d384e9de07305e1b6ee7b3e86fe0de73cae235f348e26adb7455152a82703d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. The embedded URLs are likely used to host or redirect to malicious content, potentially leading to further compromise.

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://irieint.com/uploads/1/3/1/1/131163744/131163744.html#coin+glitch+subway+surfers
    • http://webdisk.flbenthos.org/uploads/1/3/0/5/130542965/1222694.pdf
    • http://www.thecraftjunkies.com/uploads/1/3/0/6/130620441/siwitasawezajap-zizetupul.pdf
    • http://positivelyfitnh.com/uploads/1/3/0/8/130873737/960611.pdf
    • http://mikemythphotography.com/uploads/1/3/0/2/130289201/damanuz.pdf
    • http://thefountainofjoy.org/uploads/1/3/0/2/130272909/0f3c61c0.pdf
    • http://www.reformandgovernance.com/uploads/1/3/0/6/130603874/nabelot_vijaxelifozarir.pdf
    • http://andorliehillstrom.com/uploads/1/3/0/6/130604247/710247f9a.pdf
    • http://millsdigital.com/uploads/1/3/0/4/130488401/7696077.pdf
    • http://emotioncodetherapy.com/uploads/1/3/0/6/130639017/23b5f60.pdf
    • http://www.romymon.com/uploads/1/3/0/4/130476505/gozimubojabivuz.pdf
    • http://deltwaco.com/uploads/1/3/0/3/130379429/5196764.pdf
    • http://authorbethehemann.com/uploads/1/3/0/6/130621089/vagarawusofaloxe.pdf
    • http://restorationtees.com/uploads/1/3/0/5/130546519/6764248.pdf
    • http://splinteredmindshirts.com/uploads/1/3/0/7/130740164/d67c54e3b64.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_off0000530c.bin
507dda771b03515175dde83dbbd021d417a3f89dbd2394ceffd16be0fb97fa8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x530C 6892 bytes

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